Answer:
B
Explanation:
i got it right on the usatestprep
A snail crawling at 5 mm/s travels 2 m along a wall. How long does this take?
Answer:
0.4
Explanation:
time is disance divided by speed.
2
Select the correct answer.
What does the law of conservation of energy state?
OA.
Energy can be created from nothing.
OB.
Energy cannot be destroyed.
O C.
Energy cannot change forms.
OD.
The total amount of energy in a system changes continuously.
Answer:
D
Explanation:
The total amount of energy and matter in the Universe remains constant, merely changing from one form to another. The First Law of Thermodynamics (Conservation) states that energy is always conserved, it cannot be created or destroyed. In essence, energy can be converted from one form into another.
Answer: B) Energy cannot be destroyed
Explanation:
I had this question on a recent test and I got it right
Hope this helps! :)
An object originally moving at a speed of 20. meters per second accelerates uniformly for 5.0 seconds to a
final speed of 50. meters per second. What is the acceleration of the object?
Answer:
92
Explanation:
plz help, and no silly answers cuz i will report you
How much force (newtons) is required to accelerate a 2.55 kg remote-controlled toy car at a rate of 6.00 m/s2
Answer:
15.3 N
Explanation:
Force = mass x acceleration
= 2.55 kg x 6.00 m/s^2
= 15.3 kgm/s^2 = 15.3 N
The required force to accelerate a 2.55 kg remote-controlled toy car at a rate of 6.00 m/s^2 be 15.3 N.
What is force?The definition of force in physics is: The push or pull on a mass-containing item changes its velocity.
An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. The application of force is the location at which force is applied, and the direction in which the force is applied is known as the direction of the force.
Given parameters:
Mass of the remote-controlled toy car : m = 2.55 kg.
Acceleration of the remote-controlled toy car :a = 6.00 m/s^2
Now according to Newton's 2nd law of motion,
Force = mass x acceleration
= 2.55 kg x 6.00 m/s^2
= 15.3 kgm/s^2
= 15.3 N
Hence, required force is 15.3 N.
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(03.07 MC)
A 660 kg car is travelling around a circular track of radius 55.0 m at 11.5 m/s.
Calculate the force and its direction that provides the centripetal force acting on the car to keep it
in the circular path. (3 points)
a) 24 N toward the center of the circle
b) 24 N along the line tangent to the circle
c) 1.587 E3 N along the line tangent to the circle
d) 1.587 E3 N toward the center of the circle
Answer: D) 1.587 E3 N toward the center of the circle
This is the same as saying 1.587*10^3 newtons, or we can say 1587 newtons
=================================================
Work Shown:
m = mass = 660 kilograms
v = velocity = 11.5 meters per second
r = radius of circle = 55.0 meters
-------------
F = centripetal force = inward pulling force toward center of circle
F = (m*v^2)/r
F = (660*11.5^2)/55
F = 1587
F = 1.587 * 10^3
F = 1.587 E 3
The "E 3" notation is what many calculators display scientific notation to be
The units for the force here are in newtons.
The force is pulling on the object toward the center of the circle, which helps keep the car on the circular path, rather than it going off on a tangent.
Once the offense comes to the line of scrimmage in one formation, it cannot change to another formation true or false
Answer:
False.
Explanation:
This question refers to the rules of American Football. Thus, the line of scrimmage is an imaginary boundary that is established between both teams, to which the offensive line and the defensive line go to start the play.
In this situation, the offensive team must have 7 players in its formation, but within this some players can perform certain movements, with which it is incorrect to say that the formation cannot be modified, since it is constantly seen as some players, such as wide receivers, for example, move during scrimmage formation.
Which of the following statements it's true about Sir isaac Newton
A.He discovered gravity when an apple fell on his head
B. He found that gravity was the strongest force
C. He made a connection between the mass of an object and the distance between them
D. He realized that the moon orbits Earth
Sir isaac Newton made a connection between the mass of an object and the distance between them.
According to Newton's law of universal gravitation, every object in the universe attracts each other with a force directly proportional to the product of the masses of the object and inversely proportional to the distance between the two objects.
[tex]F = \frac{Gm_1m_2}{R^2}[/tex]
where;
G is the gravitational constantm₁ and m₂ are the masses of the two objects R is the distance between the two objects
Thus, we can conclude that Sir isaac Newton made a connection between the mass of an object and the distance between them.
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If two equal forces act on an object in opposite directions, what is the net
force? What is the objects acceleration?
Answer:
Net Force = 0
Explanation:
Causes objects to accelerate. Balanced Forces. Two equal forces push in opposite direction causing no change in motion causing net force = 0.
1. What is the gravitational force of attraction between two 800 kg spherical objects that are 5 m apart? What would the gravitational force of attraction between these two objects be if the distance between them was changed to 10 m?
Answer:
the force of gravity between them is quadrupled .
Explanation:
Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces.
A 8,000 kg amazon truck carrying a 3000 kg package is moving at 20 m/s along a level road as shown to the left. The driver applies the brakes to slow down. The truck travels 50 meters while applying the brakes for 3.0 seconds. The package does not slide on the back of the truck. a) Calculate the rate of acceleration b) Calculate the minimum coefficient of friction between packages and the truck
Answer:
(a) -6.67 [tex]m/s^2[/tex]
(b) 0.68
Explanation:
Given that the mass of the truck, [tex]m_1=8000[/tex] kg.
Mass of the package, [tex]m_2=3000[/tex] kg.
As the package does not slide, so the acceleration of both, truck as well as the package, is the same.
Let [tex]a\;\; m/s^2[/tex] is the acceleration of the combined mass, m.
[tex]m=m_1+m_2= 8000+3000=11000[/tex] kg.
The initial velocity of the combined mass, u= 20 m/s.
Time required to stop, t=3 seconds.
Final velocity, v=0.
Displacement traveled, s=50 m.
(a) As [tex]a=\frac {v-u}{t}[/tex]
[tex]\Rightarrow a=\frac{0-20}{3}=-\frac{20}{3} =6.67 m/s^2[/tex]
Hence the acceleration of the truck is [tex]-6.67 m/s^2.[/tex]
(b) Now, [tex]a=-6.67 m/s^2[/tex] is the acceleration of the package, this acceleration is due the frictional force, f.
Due to inertia, on application of break, the package have tendency to slide to left (in the direction of velocity). But the package does not slides, this is only due to the frictional force, f, which acts in the right direction ( opposite to the direction of velocity).
So, the magnitude of frictional force required on [tex]m_2[/tex] to avoid slide is
[tex]f=|m_2a|=\frac{20}{3}m_2\times(i)[/tex]
Now, let \mu be the minimum coefficient of the friction, so
The force due to friction, [tex]f_r= \mu N[/tex],
where [tex]\mu N[/tex] is the normal reaction.
[tex]N=m_2g[/tex], where g is the acceleration due to gravity.
So, [tex]f_r=\mu m_2g\cdots(ii)[/tex]
To avoid slide, [tex]f_r\geq f[/tex]
[tex]\Rightarrow \mu m_2g\geq\frac{20}{3}m_2[/tex] [from (i)and (ii)]
[tex]\Rightarrow \mu\geq \frac{20}{3\times 9.81}[/tex] [tex][ as \;g=9.81 m/s^2][/tex]
[tex]\Rightarrow \mu \geq 0.68[/tex]
Hence, the minimum value of coefficient of friction between packages and the truck os 0.68.
Which scenario describes an effect of tornadoes on the environment? a section of forest that has been burned a path through a town with uprooted trees a town near the coast with heavy flooding a sandy beach that shows signs of erosion
Answer:
B; a path through a town with uprooted trees
Explanation:
took the quiz and got it right on edge2020!
The effect of tornadoes on the environment is a path through a town with uprooted trees. This, option B is correct.
What are tornadoes?It is the typical weather event that contains strong winds and leaves a path of destruction up to 50 miles long. It is also defined as the violently rotating column of air that touches the ground and is usually attached to a thunderstorm.
It is developed from a severe thunderstorm in warm, moist, and unstable air and extended up to 300 miles. The thunderstorms also generate heavy damage and devastate the environment in seconds and cause more fatalities.
A swirling, funnel-shaped, whirling wind is called a tornado and it is accompanied by hurricanes and storms. Strong tornadoes last for twenty minutes and the winds are between 200 mph to 300mph. The United States and Canada are mostly tornado-affecting countries.
The effect of tornadoes is a path through a town with uprooted trees and hence, the ideal solution is option B.
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What happens when the two waves meet?
A.
They superimpose and remain at the same amplitude.
B.
They experience destructive interference and cancel each other out.
C.
They experience constructive interference and have twice the amplitude.
D.
They superimpose and have half of their original amplitude.
when two or more waves meet, they interact with other. The intersection of waves with other waves is called wave interference. wave interference may occur when two waves that are traveling I opposite directions meet. the two waves pass through each other, and this affects their amplitude
A 3 kg rubber block is resting on wet concrete. The coefficient of static friction is 0.3. What is the minimum force that must be applied to the block to make the block begin to accelerate?
Answer:
You would have to find the friction force of the rubber block which would be found with the equation of Normal force (mass*gravity) times cooeficient of friction which would give 8.82 N for the amount of friction and because you need more force than 8.82 N (assuming gravity is 9.8)
We need to find the frictional force of the rubber block. This is the normal force (mass × gravity) multiplied by the coefficient of friction, which gives us a friction quantity of 8.82N. This is because it requires a force greater than 8.82N (Gravity is 9.8)
What is coefficient of friction?Mathematically, = F/N, where F represents the frictional force and N represents the normal force. Because F and N are both measured in force units (such as Newtons or Pounds), the coefficient of friction is dimensionless.The friction coefficient is the ratio of the frictional force resisting movement of two contacting surfaces to the normal force pushing the two surfaces together.Both F and N are measured in units of force (such as Newtons or Pounds), so the coefficient of friction is dimensionless. The coefficient of friction has different values for static friction and sliding friction.In stiction, the frictional force resists the force applied to the object and the object remains stationary until the force of stiction is overcome. In kinetic friction, the frictional force opposes the motion of an object.To learn more about coefficient of friction, refer to:
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A 2000 kg truck and a 500 kg car are racing. The same amount of force is applied to each of them,
Answer:
Hh
Explanation:
Ghhhh
How long is the racetrack if it takes a racecar 3.4 a traveling at 75 m/s to finish?
Answer:
255 metres
Explanation:
The answer to the question is actually quite simple. Since the car goes for 3.4 seconds, and it goes 75 metres every second, the answer is just 3.4 multiplied by 75 Metres.
One of the goals of psychology is to predict future behavior or mental processes. Which of the following scenarios best illustrates this goal?
A.
The psychologist measures Michael’s heart rate and bodily functions to better describe his behavior.
B.
The psychologist helps Michael develop strategies to manage his anxiety levels so he can focus on the game.
C.
The psychologist tells Michael that his basketball performance will improve when his anxiety levels are moderated.
D.
After careful research, the psychologist explains that Michael’s intense feelings of anxiety are hindering his basketball performance.
The statement 'the psychologist tells Michael that his basketball performance will improve when his anxiety levels are moderated' best illustrates an objective of psychology (Option C).
Psychology is a discipline that studies human behavior through the mind.The major objectives of psychology include describing, explaining, predicting, and modifying specific behaviors. Anxiety is one of the main focuses in physiology and there are many psychological treatments aimed at modifying this particular behavior.In conclusion, the statement 'the psychologist tells Michael that his basketball performance will improve when his anxiety levels are moderated' best illustrates an objective of psychology (Option C).
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Answer:
Explanation:
C
A group of athletes are trying to turn a large wheel and axle to move a stone. What can they do to move the wheel with less effort?
what do you get when you combine helium and carbon
Answer: oxygen
Explanation: Helium burns into carbon and carbon combines with helium to make oxygen.
Answer:
The internal core collapses, and heats up, until it is hot enough to fuse helium into larger atoms, for instance, by combining three helium atoms into carbon. At this same time, some helium will fuse with that carbon to produce oxygen. ... it becomes essentially a free-for-all for creating heavier and heavier atoms.
Explanation:
Hope this is helpful, Have a Great Day/Night!!
A kayakeris paddling 2.50 m/s at an angle of 45° (northeast) and the current is moving 1.25 m/s at an angle of 315° (southeast). What is the kayaker's total velocity?
The kayaker has velocity vector
v = (2.50 m/s) (cos(45º) i + sin(45º) j )
v ≈ (1.77 m/s) (i + j )
and the current has velocity vector
w = (1.25 m/s) (cos(315º) i + sin(315º) j )
w ≈ (0.884 m/s) (i - j )
The kayaker's total velocity is the sum of these:
v + w ≈ (2.65 m/s) i + (0.884 m/s) j
That is, the kayaker has a velocity of about ||v + w|| ≈ 2.80 m/s in a direction θ such that
tan(θ) = (0.884 m/s) / (2.65 m/s) → θ ≈ 18.4º
or about 18.4º north of east.
What refers to the bending of light as it passes from one medium into another?
10. Which of the following arrangements of visible light colors shows decreasing wavelength?
A. red, orange, yellow, green, blue, indigo, violet
B. red, yellow, green, orange, violet, blue, indigo
C. violet, blue, green, orange, red, indigo, yellow
D. violet, indigo, blue, green, orange, yellow, red
12. What refers to the splitting of white light into seven different colors?
A. dispersion
B. refractive index
C. reflection
D. refraction
13. Refractive Index is a ratio between the speed of light in vacuum and .
A. speed of light in vacuum
B. speed of sound in vacuum
C. speed of light in a medium
D. speed of sound in a medium
15. Based on the colors of light, what color comes between red and yellow?
Answer:
9.Refraction
13.refractive index is the ratio of velocity of light in a vacuum to it's velocity I. a specified medium.
12.dispersion
14.Orange with a wavelength of about 585-620
I have no idea of number 10
DESPERATE WILL GIVE BRAINLSIT
During the Paleozoic Era glaciers moved through North American to carve out landforms.
Question 3 options:
True
False
When a car speeds up when rounding a curve, what happens to its centripetal
acceleration?
A.) It decreases
B.) It increases
C.) It remains constant.
D.) It is zero.
a train moving at a speed of 15 m/s is accelerated to 45 m/s over a 12 s period. what is the acceleration?
Answer:
2.5 m/s²
Explanation:
Given:
v₀ = 15 m/s
v = 45 m/s
t = 12 s
Find: a
a = (v − v₀) / t
a = (45 m/s − 15 m/s) / 12 s
a = 2.5 m/s²
Assuming the speed of sound is 340 m/s, what is the most likely speed of the jet shown below?
A. 200 m/s
B. 500 m/s
C. 100 m/s
D. 340 m/s
Answer:
I am assuming C.
Explanation:
The speed of the jet will be 340.0 m/sec. It is found as the ratio of speed of sound and the refractive index.
What is an index of refraction?The refractive index of a substance also known as the refraction index or index of refraction is a dimensionless quantity that specifies how quickly light passes through it in optics.
The given data in the problem is;
c is the speed of light=340 m/sec
n is the index of refraction of air =1.00273
V is the speed of the jet
The index of refraction is found as;
[tex]\rm n = \frac{C}{v} \\\\ \rm v = \frac{334}{1.00273} \\\\ v=33.07 \ m/sec[/tex]
The speed of the jet will be 340.0 m/sec.
Hence, option D is correct.
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Diffraction occurs when waves _______ around the edge of a barrier?
Answer:
travels
Explanation:
hope this helps and have a blessed day
Which describes radioactive decay of a substance?
Help!!!
Remember W = mg, 1 kg = 2.2
2) A car engine has a weight of 1500 N, what is it's mass and what is it's weight in lbs.?
Answer:
Mass is 152.95743
weight in ibs 3304.6914215069355 ibs
EXPLANATION:
1500 N = 152.95743 KG
152.95743 KG × 9.8 = 1498.982814
1 KG is 2.2 IBS
so
14o8.982814 is 3304.6914215069355
arrange this letters plss lubilsoity
Answer:
Solubility
Explanation:
found
possible to solve
A skler is traveling fast down a mountain slope. The table shows data
collected on the skier at a particular instant.
Mass
64 kg
608 N
Weight
Velocity
21 m/s, forward
Force of friction between skis and snow
6 N, backward
Force of air resistance
0.5 N, backward
Which values affect the net force on the skier?
A. The skier's weight and the force of air resistance
B. The force of friction between the skis and the snow and the force
of air resistance
C. The skier's velocity and the force of friction between the skis and
the snow
D. The skier's weight, the force of friction between the skis and snow,
and the force of air resistance
Answer:
D. The skier's weight, the force of friction between the skis and snow,
and the force of air resistance
Explanation:
If two objects, such as the the skier, and skies undergo a fast velocity downward, the net force is the total force or newtons which are all components of weight as apparent to mass and gravity, friction, which is the contact force of the skis on the snow, and air resistance which limits the air resistance is the opposite force acting on the object I'm the air relative to the density of air, cross sectional area of the object, the coefficient of drag which is based on the density of the object, it's area, and dynamic air pressure.
Pregunta 1 (1 punto)
(05.02 LC)
In a battery (voltaic cell), in which direction do electrons flow? (1 point)
a
From the negative to the positive terminal
b
From the positive to the negative terminal
c
From the copper plate to the zinc plate
d
From the top of the plates to the bottom
Pregunta 2 (1 punto)
(05.02 LC)
Which statement best describes why some materials are not magnetic? (1 point)
a
Magnetic materials have many spinning unpaired electrons
b
Paired electrons spin in opposite directions, cancelling their magnetic fields
c
Electrons of magnetic materials are loosely held by atomic nuclei
d
Magnetic materials move positively charged particles to other atoms
Pregunta 3 (1 punto)
(05.02 LC)
If Keisha's thumb points in the direction of an electrical current, what will her fingers curled around the wire represent? (1 point)
a
The opposing electric current
b
The opposing magnetic current
c
The direction of the electric field
d
The direction of the magnetic field
Pregunta 4 (1 punto)
(05.02 MC)
A light bulb provides a resistance of 20 Ω to the 30 A current that runs through it. Determine the voltage of the battery in the flashlight. (1 point)
a
0.7 V
b
2 V
c
51 V
d
600 V
Pregunta 5 (1 punto)
(05.02 MC)
Alyssa is taking a walk on a nature path near her neighborhood. She carries a compass with her. As she walks along the path, she notices the needle on the compass is occasionally deflected from its original position. If she has not changed the direction she is walking, what is most likely causing the occasional shift in the needle? (1 point)
a
Changes in pressure
b
Changes in temperature
c
Sources of electrical current
d
Changes to Earth's magnetic field
Pregunta 6 (1 punto)
(05.02 MC)
Quickly spinning the handle of a hand generator, Kevan is able to light three bulbs in a circuit. When he uses two batteries instead of the generator, the bulbs are very dim. Which statement best explains why the batteries are not able to power all three light bulbs like the generator? (1 point)
a
The batteries do not make the charges move as much
b
The generator creates less voltage
c
The batteries have higher amperage
d
The generator current is more steady
Pregunta 7 (1 punto)
(05.02 MC)
A construction worker uses an electrical device to attract fallen nails and sharp objects from a construction site. What is causing the attraction of the metal objects? (1 point)
a
An electrical wave oscillating perpendicular to the electrical device.
b
An electrical charge radiating perpendicular to the wire
c
A magnetic wave radiating perpendicular to an electrical device
d
A magnetic wave and electrical current moving in opposite directions
Pregunta 8 (1 punto)
(05.02 MC)
A tablet draws 10.0 A when plugged into a 150-V line. If another tablet has twice as much resistance, what would the current of the second tablet be if plugged into the same line? (1 point)
a
0.60 A
b
1.5 A
c
5 A
d
15 A
In a battery (voltaic cell), the electrons flow from the negative to the positive terminal.
What is meant by electric current ?Electric current is defined as the rate of flow of electric charge through any cross-section in an electric circuit.
Here,
1) In a battery (voltaic cell), the electrons flow from the negative to the positive terminal.
2) Some materials are not magnetic because, they have equal number of electrons that spin in opposite direction. Thus, the paired electrons spin in opposite directions, cancelling their magnetic fields.
3) According to Right-hand thumb rule, if Keisha's thumb points in the direction of an electrical current, her fingers curled around the wire will represent the direction of magnetic field.
4) Resistance of the light bulb, R = 20 Ω
Current flowing through the light bulb, I = 30 A
Voltage of the battery,
V = IR
V = 30 x 20
V = 600 V
5) The deflection in the needle of the compass is due to the change in the Earth's magnetic field.
6) The batteries are not able to power all three light bulbs like the generator because, the generator current is more steady.
7) The attraction of the metal objects towards the electrical device is due to an electrical wave oscillating perpendicular to the electrical device.
8) Current in the first tablet, I₁ = 10 A
Voltage applied, V = 150 V
We know that,
I [tex]\alpha[/tex] 1/R
Therefore,
I₁/I₂ = R₂/R₁
I₂ = R₁I₁/R₂
I₂ = R x 10/2R
I₂ = 10/2 = 5 A
So, the current of the second tablet is 5 A.
Hence,
In a battery (voltaic cell), the electrons flow from the negative to the positive terminal.
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