Answer:
2 seconds lol im just a kid but I know these lol who has tiktok
a particle starts from rest and moves with a constant acceleration of 0.5 m/s². Calculate the time taken by particle to cover a distance of 25 m
A 70 kg box undergoes a horizontal acceleration of 3.0 m/s^2 on a level surface when pulled by a 130 N force, What is the coefficient of kinetic friction between the box and the surface?
I think there's a typo in the question...
Vertically, the box is in equilibrium, so its weight and the normal force (magnitudes w and n, respectively) are such that
n + (-w) = 0
The box has mass 70 kg, and assuming gravitational acceleration with magnitude g = 9.80 m/s², it has a weight of
w = (70 kg) g = 686 N
and hence
n = 686 N
Horizontally, the box is accelerated 3.0 m/s², so the net force acting on it is
∑ F = (70 kg) (3.0 m/s²) = 210 N
and the only forces acting in this dimension are the pulling force with magnitude 130 N and the friction force with magnitude f so that
130 N - f = 210 N
The friction force is proportional to the normal force by a factor of µ, the coefficient of kinetic friction, so that
f = µ n
and so we have
130 N - µ (686 N) = 210 N → µ ≈ -0.117
but µ can't be negative!
The problem is that the pulling force should have a magnitude larger than that of the net force, so either the given mass, acceleration, or pulling force are incorrect.
What does Radioactivity mean?
Answer:
Radioactivity means: the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.
Explanation: I hope this helps! :)
Answer:
sending out harmful radiation caused when the nuclei (=central parts) of atoms are broken up.
If two negatively charged small sphere, one with twice the charge of the other, are 18cm a part in air. Calculate the charge on each if the force exerted by each on the other is 0.00081?
Answer:
q₂ = 3.81 x 10⁻⁸ C = 38.1 nC
q₁ = 7.63 x 10⁻⁸ C = 76.3 nC
Explanation:
The force between two charges is given by Coulomb's:
F = kq₁q₂/r²
where,
F = Force = 0.00081 N
k = Coulomb's Constant = 9 x 10⁹ Nm²/C²
q₁ = magnitude of 1st charge
q₂ = magnitude of second charge
r = distance between charges = 18 cm = 0.18 m
Therefore,
0.00081 N = (9 x 10⁹ Nm²/C²)q₁q₂/(0.18 m)²
q₁q₂ = (0.00081 N)(0.18 m)²/(9 x 10⁹ Nm²/C²)
q₁q₂ = 2.916 x 10⁻¹⁵ C²
q₁ = 2.916 x 10⁻¹⁵ C²/q₂ --------------- equation (1)
It is given that:
q₁ = 2q₂ --------------- equation (2)
Comparing equation (1) and equation (2):
2q₂ = 2.916 x 10⁻¹⁵ C²/q₂
q₂² = 2.916 x 10⁻¹⁵ C²/2
q₂ = √14.58 x 10⁻¹⁶ C²
q₂ = 3.81 x 10⁻⁸ C = 38.1 nC
using this value in equation (2):
q₁= 2(3.81 x 10⁻⁸ C)
q₁ = 7.63 x 10⁻⁸ C = 76.3 nC
what is the net force
Answer:
20 N in West direction.
Explanation:
opposite forces cancel each other. so 20 N in north and 20N in south cancel each other. In west and east direction...
70N in west-50N in east= 20N in west
As the frequency of a wave increases...
A.)the energy carried by the wave decreases
B.)the wavelength of the wave decreases
C.)the amplitude of the wave decreases
D.)the speed of the wave increases
What is the velocity of galaxy mice
Explanation:
Both galaxies show bicones of high ionisation gas extending along their minor axes. In NGC 4676A the high gas velocity .
please. follow. me
How do you think weather can increase the demand for electricity?
Someone help me! it's 1:23am were i live and i feel like my brain is going to implode
Answer:
Extreme temperatures can increase demand for heating and cooling, and the resulting increases in electricity demand can push up fuel and electricity prices.
Explanation:
A car, initially traveling at 5 meters per second north, accelerates to 25 meters per second north in 4.0 seconds. Determine the magnitude and direction of the car's acceleration.
Answer:
a = 5 [m/s²]
Explanation:
To solve this equation we must use the following equation of kinematics.
[tex]v_{f} =v_{o} +a*t[/tex]
where:
Vf = final velocity = 25 [m/s]
Vo = initial velocity = 5 [m/s]
a = acceleration [m/s²]
t = time = 4 [s]
Note: The positive sign for the acceleration in the above equation means that the car is increasing its velocity.
25 = 5 +a*(4)
25 - 5 = 4*a
20 = 4*a
a = 5 [m/s²]
ANSWER EVERYTHINGG PLEASE
4.
You are riding your bike and you slam on your breaks. What is most likely the accelerations that your bike undergoes? this is a quiz
Answer:
This question appear incomplete
Explanation:
This question appear incomplete because of the absence of options but when you slam on the brakes when riding a bike or other vehicles, the bike undergoes deceleration. Deceleration is a type of acceleration with a negative value which usually points in the opposite direction of the velocity. As described in the question, deceleration is usually brought about by a decrease in magnitude of a velocity.
What is a super dense gravitationally collapsed mass from which no light
can escape called?
1) neutron star
2) pulsar
3) supernova
4) black hole
Velocity is different from speed because it has both size and... what?
Velocity is size and direction
Tap the point on this graph where the ball has the greatest Kinetic Energy if it were to move from Point A to G. Target Image
I don't understand the question
Answer:
As the ball falls from C to E, potential energy is converted to kinetic energy. The velocity of the ball increases as it falls, which means that the ball attains its greatest velocity, and thus its greatest kinetic energy, at E. 19.
Explanation:
A student wishes to conduct an investigation on heat transfer that demonstrates convection, Which
method should the student use?
A.
Pour hot, colored water into a bowl of cooler water that is another color,
B.
Melt chocolate bars in a microwave at different settings,
C.
Leave a glass of ice water outside in the direct sunshine.
D.
Place a spoon that is room temperature on top of a hot burner on a stove,
A 20kg block is sliding down a 30° ramp at a constant velocity. Calculate the normal force acting on the block. Calculate the coefficient of kinetic friction between the block and the ramp.
Let me try:
Normal force= 169.74N
Coefficient of kinetic friction= 0.577
Explanation
a. For a given inclined plane, normal friction is equal to the force perpendicular to the plane which is equal to
mgcos theta = 20×9.8× cos30 = 169.74N
b. The coefficient of kinetic friction for an inclined plane is given as
tan theta =tan 30 = 0.577
PLEASE HELPPPP You have a oxygen atom that is looking to bond. How many atoms of one element from column 1 would need to bond with that oxygen to form an ionic bond? Why?
Answer:
Two atoms from column 1. Each would give 1 electron to the Oxygen. Oxygen will be 2- and each group 1 ion will be 1+
Explanation:
Sorry if Im wrong
A 15 kg object has a momentum of 150 kg-m/s north. What is the object's
velocity?
O A. 135 m/s
O B. 2,250 m/s
O C. 0.1 m/s
O D. 10 m/s
Answer:
10 m/s
Explanation:
divide 150 by 15
Answer:
[tex]\boxed {\boxed {\sf D. \ 10 \ m/s}}[/tex]
Explanation:
Momentum can be found by multiplying mass by velocity.
[tex]p=mv[/tex]
If we rearrange this formula for velocity (v), then the formula becomes:
[tex]\frac{p}{m}=\frac{mv}{m}[/tex]
[tex]\frac{p}{m} =v[/tex]
We have to divide the momentum by the mass. The momentum is 150 kg*m/s and the mass is 15 kilograms.
[tex]p=150 \ kg*m/s\\m=15 \ kg[/tex]
Substitute the values into the formula.
[tex]\frac{150 \ kg *m/s}{15 \ kg} =v[/tex]
Divide. Note that the kilograms (kg) will cancel each other out.
[tex]10 \ m/s=v[/tex]
The velocity of the object is 10 meters per second.
Which of the following is an example of a luminous object?
Dog
Tree
Candle
Moon
Answer:
Candle
Explanation:
The moon is an illuminated object, while a candle is a luminous object!
Answer:
Candle
Explanation:
I just took the test
Diane is training for a marathon and goes to the track (400 m) to run every morning.
If Diane runs around the track four times, what is her final displacement?
280 m
If Diane runs around the track 6 times, what is the distance she travels?
a measuring cylinder contains 30cm3 of a liquid some more of the liquid is added until the liquid level reaches the 50cm3 mark the reading on the balance increases by 30g what is the density of liquid?
Answer:
1.5g/cm³
Explanation:
Given parameters:
Initial volume of the liquid = 30cm³
Final volume of the liquid = 50cm³
Mass of the liquid = 30g
Unknown:
Density of the liquid = ?
Solution:
Density is the mass per unit volume of a substance.
Density = [tex]\frac{mass}{volume}[/tex]
volume of the liquid = final volume - initial volume = 50cm³ - 30cm³
volume of the liquid = 20cm³
Density = [tex]\frac{30}{20}[/tex] = 1.5g/cm³
A 1250 kg Nascar is at the starting line. The race starts and the car reaches a speed of 30
m/s in 10 seconds. What is the force of the car? (Hint: Remember that acceleration
change in velocity / time.)
Answer:
force=1250kg * 30m/s+10
Explanation: it's a change in acceleration
Physical activity increases your risk for coronary artery disease. true false
Answer:
false here is why :)
Explanation:
Regular, moderate-intensity physical activity reduces the risk of developing coronary heart disease and can reduce the likelihood of dying from heart disease.
hope this helped.
what do electrons move from
Answer:
Negatively charged, to positively charged parts
Explanation:
Electrons are negative, negative is attracted to positive.
WILL GIVE BRANLIEST TO WHOEVER ANSWERS CORRECTLY
We are going to design a free-fall ride in which our vehicle has a velocity of 33m/s once the vehicle reaches the bottom.
Calculate how tall the ride would have to be in order for the vehicle to reach a velocity of 33m/s.
Answer:
We might know that the greater the acceleration of, say, a car moving away from a stop sign, the greater the displacement in a given time. But we have not developed a specific equation that relates acceleration and displacement. In this section, we develop some convenient equations for kinematic relationships, starting from the definitions of displacement, velocity, and acceleration already covered.
Explanation:
Answer:9 meters?
Explanation:
A football is thrown with a horizontal velocity of 15.0 m/s and a vertical velocity of 4.25m/s. What is the football's velocity?
What are gears and what is a lever ?
Answer:
agear lever or agear stick is the lever that you use to change gear in acar or other vehicle
a bird is traveling west with a velocity of 8 m/s and momentum of 40 mg*m/s what's the birds mass?
Answer:
m = 5 [mg]
Explanation:
We must remember that the definition of linear momemtum is defined as the product of mass by distance.
P = m*v
P = momentum = 40 [mg*m/s]
m = mass [mg]
v = velocity = 8 [m/s]
Now clearing m:
m = P/v
m = 40/8
m = 5 [mg]
The whale shark is the largest of all fish and can have the mass of three adult
elephants. Suppose that a crane is lifting a whale shark into a tank for delivery
to an aquarium. The crane must exert an unbalanced force of 2.5 x 104 N to
lift the shark from rest. If the shark's acceleration while being lifted equals
1.25 m/s², what is the shark's mass?
Answer:
m = 20,000 kg
Explanation:
Force, [tex]F=2.5\times 10^4\ N[/tex]
Acceleration of the shark, [tex]a=1.25\ m/s^2[/tex]
It is required to find the mass of the shark. Let m is the mass. Using second law of motion to find it as follows :
F = ma
Putting the value of F and a to find m
[tex]m=\dfrac{F}{a}\\\\m=\dfrac{2.5\times 10^4}{1.25}\\\\m=20,000\ kg[/tex]
So, the shark's mass is 20,000 kg.
Which is unnecessary to include when accurately drawing ray diagrams?
focal point
lens
focal length
three easy rays
Answer:
Focal length
Explanation: No need for one...
Focal length is unnecessary to include when accurately drawing ray diagrams.
What is Focal length?The focal length is the distance, in millimeters, between the lens' optical center and the camera sensor, which records light data.
The elements inside the housing of a lens bend and shape light as it enters the front so that it converges into a single point of focus known as the "optical center."
It is crucial to remember that this measurement is made with the camera set to infinity and that lenses are named according to their focal length, which is indicated on the lens' barrel.
Therefore, Focal length is unnecessary to include when accurately drawing ray diagrams.
To learn more about Focal length, refer to the link:
https://brainly.com/question/23276372
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