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2 years ago

If an object moving at 12 m/s has a kinetic energy of 72 j what is the mass

1 answer:

5 0

Simply, apply the formula $E = \frac{1}{2}mv^{2}$ and insert the values of m = mass, v = velocity and E = Energy.
The result will be $72J = \frac{1}{2}m(12m/s)^{2}$ , m = 1 kg

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A children's roller coaster is released from the top of a track. If its maximum speed at ground level is 3 m/s, find the height

san4es73 [151]

Answer:

h = 0.46 m

Explanation:

According to the law of conservation of energy:

Potential Energy Lost by Roller Coaster = Kinetic Energy Gained by Roller Coaster

$mgh = \frac{1}{2}mv^2\\\\2gh = v^2\\\\h = \frac{v^2}{2g}$

where,

h = height = ?

v = speed at bottom = 3 m/s

g = acceleration due to gravity = 9.81 m/s²

Therefore,

$h = \frac{(3\ m/s)^2}{(2)(9.81\ m/s^2)}$

h = 0.46 m

4 0

2 years ago

Which best describes the transition from gas to liquid? (2 points) Select one: a. Energy must be removed because particles in li

Alenkinab [10]

Which best describes the transition from gas to liquid?

gas is @ higher energy state than liq. so the transition must remove energy. so ans is a. Energy must be removed because particles in liquid move more slowly.

8 0

2 years ago

Read 2 more answers

A net force is applied on a 100 kg rocket which causes the rocket to acceleration at 10 m/s2. The same net force is applied on a

ELEN [110]

Answer:

i dont know lo

Explanation:

8 0

1 year ago

If 5000Pa a pressure is exerted on an object with the contact area 0.04m^2. Calculate the mass of an object

Whitepunk [10]

Pressure = 5000 Pa
Contact Area = 0.04 m^2
Acceleration due to gravity = 9.8 m/s^2
Let the force be F.
We know, Force = Pressure × Contact Area
Therefore, Force = 5000 Pa × 0.04 m/s^2
or, Force = 200 N
We know, force = mass × acceleration
Therefore, mass = force ÷ acceleration
or, mass = 200 N ÷ 9.8 m/s^2 = 20.4 Kg

Answer:

20.4 Kg

Hope you could understand.

If you have any query, feel free to ask.

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1 year ago

2 decimeters expressed in millimeters

Alenkinab [10]

Hi!
1 decimeter = 100 millimeters.
Therefore 2 decimeters = 200 millimeters.

3 0

2 years ago