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skelet666 [1.2K]
3 years ago
5

A scientist wants to calculate the kinetic energy of a cheetah as it chases down its prey. What does the scientist need to measu

re in order to determine the kinetic energy of the cheetah?
Select all that apply.

the cheetah's amount of matter
the cheetah's speed
the amount of energy the cheetah absorbs from the sun
the amount of energy the cheetah releases into its surroundings
the cheetah's temperature
Physics
2 answers:
neonofarm [45]3 years ago
5 0

Answer:

the cheetah's amount of matter

the cheetah's speed

Explanation:

Kinetic energy is calculated according to the following equation

K.E = \frac{mv^{2} }{2}

where m represents the mass of the body in kilograms

and v represents the magnitude of the velocity which is know as speed of the body in m/s

Knowing this then, the scientist needs two things from that list:

the cheetah's amount of matter (also known as the mass)

the cheetah's speed

Feliz [49]3 years ago
4 0

Answer:

A + B

Explanation:

A) The cheetah's amount of matter

B) The cheetah's speed

(P.S. I just took a test on this and got it correct.)

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A freight train rolls along a track with considerable momentum. If it were to roll at the same speed but had twice as much mass,
fomenos

Answer:

The momentum would be doubled

Explanation:

The magnitude of the momentum of the freight train is given by:

p=mv

where

m is the mass of the train

v is its speed

In this problem, we have that the speed of the train is unchanged, while the mass of the train is doubled:

m'=2m

therefore, the new momentum is

p'=m'v=(2m)v=2(mv)=2p

so, the momentum has also doubled.

7 0
3 years ago
The objects listed are placed at the top of a ramp and roll down to the bottom without slipping. Assuming that there is no air r
Thepotemich [5.8K]

Explanation:

For each object, the initial potential energy is converted to rotational energy and translational energy:

PE = RE + KE

mgh = ½ Iω² + ½ mv²

For the marble (a solid sphere), I = ⅖ mr².

For the basketball (a hollow sphere), I = ⅔ mr².

For the manhole cover (a solid cylinder), I = ½ mr².

For the wedding ring (a hollow cylinder), I = mr².

If we say k is the coefficient in each case:

mgh = ½ (kmr²) ω² + ½ mv²

For rolling without slipping, ωr = v:

mgh = ½ kmv² + ½ mv²

gh = ½ kv² + ½ v²

2gh = (k + 1) v²

v² = 2gh / (k + 1)

The smaller the value of k, the higher the velocity.  Therefore:

marble > manhole cover > basketball > wedding ring

7 0
3 years ago
Object 1 of mass m moves with speed v in the positive direction. Object 2 of mass 3 m moves with speed 4 v in the negative x-dir
Klio2033 [76]

Answer:

This means that the kinetic energy of second object is 48times that of the first object

Explanation:

Kinetic energy is the energy possessed by a body by virtue of its motion e.g motion of an accelerating car. Mathematically,

Kinetic energy = 1/2mv² where;

m is the mass of the object

v is the velocity of the object

If Object 1 of mass m moves with speed v in the positive direction, its kinetic energy will be expressed as;

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For Object 2 of mass 3m moving with speed 4v in the negative x-direction, its kinetic energy can be expressed as;

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To compare the kinetic energy of both bodies, we will take the ratio of K2:K1 to have;

K2/K1 = 24mv²/(1/2)mv²

K2/K1 = 24/(1/2)

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K2 = 48K1

This means that the kinetic energy of second object is 48times that of the first object and moving in the negative x direction since the body of mass 3m initially moves in the negative x direction.

3 0
3 years ago
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