Answer:
true
Explanation:
hope I helped a bit
Muscles covert chemicals energy int
Answer:
Mechanical energy
Explanation:
Mechanical energy is needed for movement of objects. Muscles convert chemical energy provided by the rest of the body to allow movement.
1. If a ball is rolling horizontally on the floor with a velocity of 2.5 m/s, what are the x and y
components of the velocity?
Vx =
Vy =
Answer: Vx = 2.5m/s and Vy = 0m/s
Explanation: The ball is rolling horizontally on the floor, meaning there isn't a change in the vertical position, only horizontal. The ball is rolling with pure horizontal motion and isn't moving in the vertical direction.
Runner A is initially 5.8 km west of a flagpole and is running with a constant velocity of 8.6 km/h due east. Runner B is initially 4.9 km east of the flagpole and is running with a constant velocity of 7.1 km/h due west. How far are the runners from the flagpole when their paths cross? Answer in units of km.
Answer:
Runner A will be 0.05 km from the flagpole, and runner B will be 0.07 km from the flagpole
Explanation:
We can find when their paths will cross as follows:
[tex] X_{f} = X_{0} + v_{0}t + \frac{1}{2}at^{2} [/tex]
Where:
[tex]X_{f}[/tex] is the final position
[tex]X_{0}[/tex] is the initial position
v₀ is the initial speed
t is the time
a is the acceleration = 0 (since they are running with a constant velocity)
When their paths cross we have:
[tex]X_{fA}+X_{fB}=5.8+4.9=10.7 km[/tex]
[tex]V_{A}t+V_{B}t=10.7[/tex]
[tex]8.6t+7.1t=10.7[/tex]
[tex]t = 0.68 h[/tex]
Now we can find the final distance of each runner.
[tex]X_{fA}=V_{A}*0.68[/tex]
[tex]X_{fA}=8.6*0.68 km[/tex]
[tex]X_{fA}=5.85 km[/tex]
[tex]X_{fB}=V_{B}*0.68[/tex]
[tex]X_{fB}=7.1*0.68[/tex]
[tex]X_{fB}=4.83 km[/tex]
Therefore, runner A will be 0.05 km from the flagpole, and runner B will be 0.07 km from the flagpole.
I hope it helps you!
what is the definition of physics?
A.the study of living organisms, divided into many specialized fields that cover their morphology, physiology, anatomy, behavior, origin, and distribution
B.the branch of science that deals with the identification of the substance of which matter is composed
C.the branch of science concerned with the nature and properties of matter and energy
D.the branch that deals with the relations of organisms to one another and to their physical surroundings
Answer:
your answer should be c
Answer:
D.the branch that deals with the relations of organisms to one another and to their physical surroundings
Light takes 1.28 s to travel from the Moon to Earth. What is the distance between them?
Answer:
384,000
Explanation:
Time taken by light to travel from earth to moon t=1.28s
Let us assume that the speed of light = c
So, the distance traveled by light in this time = c x t
this will be the distance which light traveled to reach moon, so this will be the distance between earth and moon.
The speed of light is 300000 km/s
By putting the values
we get
Distance = c x t
= 300000 x 1.28 km
=384000 km
Joe went to see his Grandmother. He promised his Grandma that he would arrive at her house at 5 pm. He leaves his house at 3:00 and this will allow him 2 hours to get to her house. Joe will need to travel 70 miles to get to her house. How fast will Joe need to drive to make it to Grandma's house on time?
Answer:
35 mph
Explanation:
From the question given above, the following data were obtained:
Time (t) = 2 hours
Distance (d) = 70 miles
Speed (S) =.?
Speed is simply defined as the distance travelled per unit time. Mathematically, it is expressed as:
Speed (S) = Distance (d) / Time (t)
S = d/t
With the above formula, we can calculate how fast (i.e the speed) Joe will need to drive to make it to his Grandma's house on time. This can be obtained as follow:
Time (t) = 2 hours
Distance (d) = 70 miles
Speed (S) =.?
S = d/t
S = 70/2
S = 35 mph
Therefore, Joe will drive at 35 mph in order to get to his Grandma's house on time.
Do all the molecules of a liquid take part in evaporation? If not , explain.
Answer:
no
Explanation:
only the ones near the surface have enough kinetic energy
Answer:
no
Explanation:No, all the molecules of the liquid do not take part in evaporation only those molecules near the surface of liquid which acquire sufficient Kinetic energy (Thresold velocity) escape as they attractive forces of other molecules. Then other molecules come to the surface of the liquid and acquire more K.E. and escape the surface. This continues till all the liquid evaporates.
People playing a basketball game in a gymnasium make up a closed system
with 17,125 J of energy. At the beginning of the game the system has 16,250
J of ME, and at the end it has 1,135 J of ME. How much of the total energy
was transformed into thermal energy during the game?
Answer:
15,115 J of the total energy is transformed to thermal energy during the game.
Explanation:
From the law of conservation of energy, initial energy of the closed system E = final energy of closed system , E'
E = E'.
Let ME = initial mechanical energy of the system = 16,250 J and U = initial internal energy of the system and ME' = Final mechanical energy of the system = 1,135 J and U' = Final internal energy of the system.
So E = ME + U and E' = ME' + U'
We now find U and U'
Substituting E, ME, E' and ME' into the equations, we have
E = ME + U
17,125 J = 16,250 J + U
U = 17,125 J - 16,250 J
U = 875 J
E' = ME' + U'
17,125 J = 1,135 J + U'
U' = 17,125 J - 1,135 J
U' = 15,990 J.
The change in internal energy is also the change in thermal energy. So,
ΔU = U' - U
ΔU = 15,990 J - 875 J
ΔU = 15,115 J
So 15,115 J of the total energy is transformed to thermal energy during the game.
What is the difference between fitness activities and team sports? Provide an example for both reasons.
Answer:
you get to participate in a activity but not in PE that you have to do
Explanation:
A 15kg block of frozen water is being acted upon
by two forces as shown. Which of the following
diagrams will have the smallest net acceleration?
A)
F2=10N
F =28N
B)
F=100N
Fi=90N
0)
Fi=4N
F2=12N
D)
Fi=150N
F2=140N
Answer:
C
Explanation:
I'm not 200% sure whether net acceleration would be F1 - F2 or F1 + F2, but C works in both scenarios. Either the net acceleration is 18 N, which is the lowest, or it is 8 N, which is also the lowest.
Kinetic and potential energy are forms of what kind of energy?
gravitational
chemical
electrical
mechanical
Answer:
mechanical energy
Explanation:
The key difference that exists between kinetic energy and potential energy lies in the fact that, potential energy is that form of mechanical energy which is stored within an object, ready to be released as and when needed to do some work, while, kinetic energy is that form of mechanical energy that has been released and is associated with the body in motion.
An object that does not vibrate cannot produces what?
A.sound
B.light
C.heat
D.electricity
Answer:
An object that does not vibrate cannot produce sound
PLEASEEE HELPPPPPPP:
A current of 15 Amps flows through a circuit with a resistance of 0.10 Ohms. What is the voltage?
A current of 15 amperes is flowing with a resistance of 0.10 ohms, then the voltage will be equal to 1.5 volts.
What is Electrical energy?When put in an electromagnetic field, charged matter experiences a force due to the fundamental property of electric charge. Positive or negative electrical ions are possible.
When two charges are in opposition to one another, they repel one another. The term "neutral" refers to an object that has no net charge. The early understanding of the way charged particles interact is now referred to as classical electrodynamics, and it is still true for issues that do not demand taking into account quant phenomena.
Electrical charge is a preserved attribute, meaning that the net charge of an isolated system—that is, the sum of the positive and negative charges—cannot change. Particles at the subatomic level carry an electric charge.
As per the data given in the question,
Current, I = 15 A
Resistance, R = 0.10 ohms
Then, the voltage (V) will be,
V = RI
V = 15 × 0.10
V = 1.5 volts.
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BRAINLIEST WILL BE GIVEN
Answer:
Mac’s Speed = 2.5 m/s
Tosh’s Speed = 4 m/s
Tosh moves 1.5 m/s faster than Mac.
Explanation:
Tosh starts from an initial position of 12m and in a span of 3 seconds, (1.00 seconds to 4.00 seconds) he moves 12 meters.
So his speed is distance / time
s = 12 / 3
s = 4 m/s
Mac starts from an initial position of 2m and in a span of 4 seconds, he traveled 10m (2.00m to 12.00m).
Speed = Distance / time
s = 10 / 4
s = 2.5 m/s
a student pushes a book with a force of 5 N to the east.which statement
describes the reaction force?
Answer:
5N westward, acting on the student
Explanation:
Answer: 5N westward, acting on the student
Explanation:
The two objects have different masses, the more massive object pulls with a greater force. TRUE OR FALSE?
Answer:
on earth yes, but in space no because there is no gravity
Explanation:
plz can i have some points
The force exerted by an object depends on the mass of the object. Greater mass results in greater force. Hence, the statement is true.
What is force?Force is an external agent acts on a body to change the substance from the state of rest or motion. There are various kinds of force such as nuclear force, magnetic force, frictional force etc.
According to Newton's law of motion force in a moving body is the product of its mass and acceleration. Hence, force is directly proportional to mass and acceleration and an increase in these quantities will increase the force exerted by the body.
Thus, greater force is needed to a move a body with greater mass. If two objects of different masses exerts force each other, the greater force will be exerted by the massive body.
To find more on force, refer here:
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A golfer imparts a speed of 29.0 m/s to a ball, and it travels the maximum possible distance before landing on the green. the tee and the green are at the same elevation. (a) how much time does the ball spend in the air? (b) what is the longest hole in one that the golfer can make, if the ball does not roll when it hits the green?
Explanation:
It is given that,
Initial speed of a golfer, u = 29 m/s
If it travels the maximum possible distance before landing. It means that it is projected at an angle of 45 degrees.
(a) We need to find the time spent by the ball in the air. It can be calculated by using second equation of motion.
[tex]s=ut+\dfrac{1}{2}at^2[/tex]
Here,
a = -g
s = 0 (it is displacement and it is equal to 0 as the ball lands on the green).
So,
[tex]0=29\sin(45)t-\dfrac{1}{2}\times 9.8t^2\ (\text{Initial vertical component of velocity is taken})\\\\-4.9t^2+29\times \dfrac{1}{\sqrt2}t=0\\\\-4.9t^2+20.5t=0\\\\t=0,4.184\ s[/tex]
So, it will take 4.184 seconds in the air.
(b) let x is the longest hole in one that the golfer can make if the ball does not roll when it hits the green. It can be given by :
[tex]x=vt\cos\theta\\\\x=29\times 4.184\times \cos(45)\\\\x=85.79\ m[/tex]
Hence, this is the required solution.
What is the biggest animal on land?
Answer:
elephant
Explanation:
Answer:
elephant
Explanation:
Which option is an example of a surface wave?
A. A light wave
B. A wave on top of water
C. A sound wave
D. A wave carried through a rope
Surface waves are winds blowing through the surface of ocean water. Therefore, option B is correct. All other options are just examples of waves and not wind.
What are surface waves ?Ocean water flows in currents, much like air does in the atmosphere. A current is an oceanic current, or stream, of flowing water. The primary cause of surface currents is wind, although not daily winds.
The main wind belts are what produce surface currents. These winds always blow in the same direction. so that they can maintain the direction of the water's flow.
Three factors influence surface currents: global wind patterns, Earth's rotation, and the configuration of ocean basins. Because they disperse heat over the earth, surface currents are crucial. Global climate is significantly influenced by surface currents as well.
Find more on surface waves:
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A ball of mass 200 g rolls along the ground at a speed of 5.2 m/s. Calculate the kinetic energy of the ball.
Answer:
We have a mass of 200g (0.2kg) moving at 20m/s
Kinetic Energy KE = ½ mv^2 where m is mass and v is velocity
Actually, v is a vector quantity, so KE = ½ mv•v
The dot product of 2 vectors a and b is abCosθ where θ is the angle between the vectors.
Obviously v•v = v^2 Cos0 = v^2
In this case, we have KE = ½ (0.2)(20^2) = 40kg-m^2/s^2 = 40J
So we have kinetic energy in the amount of 40 Joules.
Explanation:
The right answer is "2.7 J"
Answer explanation:
Remember to convert grams to kilograms first by dividing by 1000.
Kinetic energy
= 1/2 × mass × speed2
= 1/2 × 0.2 kg × (5.2 m/s)^2
= 2.7 J (to 2 sig. fig.)
Hope it helps ✨✨
what is the first step to CPR
Answer:
call for help and check if the person has not passed out (check their pulse.)
Explanation:
A water-balloon launcher with a mass of 2.0 kg is suspended on a wire. It
fires a 0.75 kg balloon to the west at a velocity of 14.0 m/s. What is the
resulting velocity of the launcher if the net force on the launcher is equal to
the reaction force?
A. 5.3 m/s east
B. 7.4 m/s east
C. 37.3 m/s east
D. 6.6 m/s west
Answer:
b
Explanation
Answer: 5.3 ms east
Explanation:
which force produces acceleration in falling bodies?
Answer:
Gravity produces acceleration
At a objects highest point is the acceleration zero too?
Answer:
Acceleration from gravity is always constant and downward, but the direction and magnitude of velocity change. At the highest point in its trajectory, the ball has zero velocity, and the magnitude of velocity increases again as the ball falls back toward the earth
Explanation:
Answer:
No
Explanation:
becuse it's not even outer space there's acceleration there's no such thing as Zero acceleration speed except if you're not in motion.
A toy car, initially travelling in a straight line at 30.0 cm/s, slows down with a constant linear acceleration of 3.0 cm/s2. How much time passes before the toy car comes to a halt?
Answer:
The toy car stops after 10 seconds.
Explanation:
Constant Acceleration Motion
It's a type of motion in which the velocity of an object changes uniformly at a rate called acceleration.
Being a the constant acceleration, vo the initial speed, vf the final speed, and t the time, the following relation applies:
[tex]v_f=v_o+at\qquad\qquad [1][/tex]
The toy car moves at vo=30 cm/s and decelerates at [tex]a=-3\ cm/s^2[/tex]. Note the negative sign of the acceleration that indicates the speed is decreasing over time.
We need to calculate the time needed for the toy car to stop vf=0.
To find the time, we solve [1] for t:
[tex]\displaystyle t=\frac{v_f-v_o}{a}[/tex]
Since all the units of speed and acceleration are in centimeters, we don't need to convert to meters
[tex]\displaystyle t=\frac{0-30}{-3}=10[/tex]
The toy car stops after 10 seconds.
Please help me with this psychics problem, forever thankful!
Place the following in order of increasing frequency (low to high).
Radio Waves
X-Rays, (1018 Hz to 1022 Hz), (1 nm to 10-3 nm)
:
Ultraviolet, (7 x 1014 Hz to 1018 Hz), (103 nm to 1 nm)
Visible Light, (4 x 1014 Hz to 7 x 1014 Hz) (700 nm to 380 nm)
Infrared, (1010 Hz to 4 x 1014 Hz), (106 nm to 103 nm)
Microwaves, (106 Hz to 1010 Hz), (1 m to 106 nm)
Gamma Rays
Answer:
I don't know how it works, but I found this on the internet. image does not belong to me.
hope it helps!
Answer:
X-RAY
Explanation:
I took the test on study island
Lincoln can run at a speed of 3 m/s. How long would it take him to run 200 meters?
Answer:Answer is 66.66666666666667
Explanation:all you have to do is divide 200/3
Answer:
66 seconds
Explanation:
time=distance/speed
200/3=66.6
Determine the horizontal component of 40m at 330 degrees?
Answer:
[tex]a_x=34.64\ m.[/tex]
Explanation:
Rectangular components of a vector
Given a vector [tex]\vec a[/tex], the x-component and y-component of the vector are given respectively by:
[tex]a_x=|\vec a|.\cos\theta[/tex]
[tex]a_y=|\vec a|.\sin\theta[/tex]
Where [tex]\theta[/tex] is the angle measured with respect to the positive horizontal direction.
Let's calculate the horizontal component of a vector with magnitude 40 m and angle 330°
[tex]a_x=40\ m.\cos330^\circ[/tex]
[tex]\boxed{a_x=34.64\ m.}[/tex]
dimensional formula of energy
Answer:
[M L2 T-2]
Explanation:
hope this is what you're looking for.
Two +1 C charges are separated by 3000 m. What is the magnitude of the electric force
¡Hello!
Topic: Electrostatic
For calculate electric force, we can apllicate formula:
[tex]\boxed{\boxed{\bold{F = k * \frac{q*q'}{r^{2} } } } }[/tex]
[tex]\sqrt{[/tex] F = Electric Force
[tex]\sqrt{[/tex] k = Coulomb Constant = 9x10^9
[tex]\sqrt{[/tex] q = Charges = 1 C
[tex]\sqrt{[/tex] r = Distance = 3000 m
Let's replace according the information, and let's resolve it:
F = 9x10^9 * (1 * 1) / 3000²
F = 9x10^9 * 1 / 9000000
F = 9x10^9 * 1.1111111e-7
F = 1000 N
Result:
The electric force is of 1000 N
Good luck
