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Keith_Richards [23]
3 years ago
5

An object has a kinetic energy of 175 J and a momentum of magnitude 25.0 kg m/s. Find the

Physics
1 answer:
DedPeter [7]3 years ago
5 0

Answer:14 m/s

Explanation:

Kinetic energy(ke)=175J

Momentum(M)=25kgm/s

Speed=v

Mass=m

Ke=(m x v x v)/2

175=(mv^2)/2

Cross multiply

175 x 2=mv^2

350=mv^2

Momentum=mass x velocity

25=mv

m=25/v

Substitute m=25/v in 350=mv^2

350=25/v x v^2

350=25v^2/v

v^2/v=v

350=25v

v=350/25

v=14 m/s

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Answer:

104 N

Explanation:

m = 1300 kg

a = 0.08m/s^2

F = 1300*0.08

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Newtons is the unit of force.

3 0
3 years ago
You hold a metal block of mass 40 kg above your head at a height of 2 m.
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Answer:

The work done by gravity is 784 J.

Explanation:

Given:

Mass of the block is, m=40\ kg

Height to which it is raised is, h=2\ m

Acceleration due to gravity is, g=9.8\ m/s^2

Now, work done by gravity is equal to the product of force of gravity and the distance moved in the direction of gravity. So,

\textrm{Work by gravity}=F_g\times h

Force of gravity is given as the product of mass and acceleration due to gravity.

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\textrm{Work by gravity}=F_g\times h=392\times 2=784\ J

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luda_lava [24]

Answer:

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Explanation:

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2 years ago
A hollow spherical shell has mass 8.20 kg and radius 0.220 m. It is initially at rest and then rotates about a stationary axis t
Likurg_2 [28]

Answer:

8.91 J

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mass, m = 8.20 kg

radius, r = 0.22 m

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angular acceleration, α = 0.890 rad/s^2

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Let the final angular velocity is ω.

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ω² = ωo² + 2αθ

ω² = 0 + 2 x 0.890 x 37.68

ω = 8.2 rad/s

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K = \frac{1}{2}I\omega ^{2}

K = 0.5 x 0.265 x 8.2 x 8.2

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I’m lost at this question, sorry but I would’ve help !
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