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antoniya [11.8K]

4 years ago

10

What is the mass of an object that creates 33,750 joules of energy by traveling at 30 m/sec?

2 answers:

maksim [4K]4 years ago

8 0

Answer:

M=75

Explanation:

33750=1/2x M x30²

30x30=900

1/2x900=450

33750/450=75

nikklg [1K]4 years ago

5 0

The Energy is Kinetic Energy.

Kinetic Energy = 1/2*mv², Where m is mass in kg, v is velocity in m/s

Energy is 33750 Juoles, v = 30m/s

1/2*mv² = E

1/2*m*30² = 33750

m = (2*33750) / (30²) Using a calculator

m = 75 kg

Mass of object is 75 kg.

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Describe the change in motion and kinetic energy of the particles as thermal energy is removed from a liquid. Which change of st

Kobotan [32]

Answer:

Change in state from liquid to solid.

Explanation:

Decrease in thermal energy will decrease energy and particles will slow down. Change in state from liquid to solid.

8 0

3 years ago

A rope swing is hung from a tree right at the edge of a small creek. The rope is 5.0 m long; the creek is 3.0 m wide.

irina [24]

Answer:

1) T = 4.5 s

2) T = 4.5 s

3) v = 9.9 m/s

Explanation:

We can use the equation

T = 2π√(L/g)

1) T = 2π√(5m/9.81 m/s²) = 4.5 s

2) T = 2π√(L/g)

T = 2π√(5m/9.81 m/s²) = 4.5 s

3) v = √(2gR)

v = √(2(9.81 m/s²)(5m))

v = 9.9 m/s

8 0

4 years ago

Read 2 more answers

Give the SI unit. For physics

IrinaVladis [17]

Answer:

metre (m) - unit of length

kilograms (kg) - unit of mass

second (s) - unit of time

ampere (A) - unit of electrical current

kelvin (K) - unit of temperature

mole (mol) - unit of the amount of substance

Explanation:

6 0

3 years ago

Assume the acceleration of the object is a(t) = −32 feet per second per second. (Neglect air resistance.) With what initial velo

alukav5142 [94]

Answer:

$v_i=189.315ft/s$

Explanation:

We are going to use the accelerated motion formula $v_f^2=v_i^2+2ad$ on the vertical component taking the upwards direction as positive.

Since <em>at maximum height the speed will be $v_f=0m/s$ </em>, the formula can be written as $v_i=\sqrt{-2ad}$ , which for our values is:

$v_i=\sqrt{-2(-32ft/s^2)(560ft)}=189.314553059ft/s=189.315ft/s$

Written to three decimal places.

3 0

4 years ago

What will have a greater weight 5 kg on earth or 20 kg on the moon?

natima [27]

The mass of 5 kg on the Earth has a greater weight than the mass of 20 kg on the moon.

Explanation:

The weight of an object is given by

$W=mg$

where

m is the mass of the object

g is the acceleration of gravity

On the Earth, the acceleration due to gravity is

$g=9.8 m/s^2$

So a mass of m = 5 kg on the Earth would weigh

$W=mg=(5)(9.8)=49 N$

On the moon, the acceleration due to gravity is

$g=1.6 m/s^2$

So a mass of m = 20 kg on the Moon would weigh

$W=mg=(20)(1.6)=32 N$

So, the mass of 5 kg on the Earth has a greater weight than the mass of 20 kg on the moon.

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7 0

3 years ago