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4 years ago

There's my problem PLEASE HELP

Physics

2 answers:

Phoenix [80]4 years ago

4 0

Answer : The correct option is, the 5 kg object has more kinetic energy.

Explanation :

Formula used for kinetic energy is:

$K.E=\frac{1}{2}mv^2$

where,

K.E = kinetic energy

m = mass of an object

v = velocity of an object

Now we have to calculate the kinetic energy for 5 kg object with velocity 10 m/s.

$K.E=\frac{1}{2}\times (5kg)\times (10m/s)^2$

$K.E=250J$

Now we have to calculate the kinetic energy for 10 kg object with velocity 5 m/s.

$K.E=\frac{1}{2}\times (10kg)\times (5m/s)^2$

$K.E=125J$

From this we conclude that, 5 kg object with velocity 10 m/s has more kinetic energy as compared to 10 kg object with velocity 5 m/s.

Hence, the correct option is, the 5 kg object has more kinetic energy.

Bas_tet [7]4 years ago

3 0

Answer:

The 10 kg object has more kinetic energy

Explanation:

Velocity is more important than mass.

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Rony fills a bucket with water and whirls it in a vertical circle to demonstrate that the water will not spill from the bucket a

Romashka-Z-Leto [24]

Answer:

0 N, 3.49 m/s

Explanation:

Draw a free body diagram for the bucket at the top of the swing. There are two forces acting on the bucket: weight and tension, both downwards.

If we take the sum of the forces in the radial direction, where towards the center is positive:

∑F = ma

W + T = m v² / r

The higher the velocity that Rony swings the bucket, the more tension there will be. The slowest he can swing it is when the tension is 0.

W = m v² / r

mg = m v² / r

g = v² / r

v = √(gr)

Given that r = 1.24 m:

v = √(9.8 m/s² × 1.24 m)

v = 3.49 m/s

8 0

3 years ago

what has more momentum, a baseball traveling at 4 m/s or a baseball traveling at 16m/s ? and which has more energy ?

Anna007 [38]

We know the formulas for momentum and energy. But they both involve the mass of
the object, and we don't know the mass of the baseball. What can we do ?

It's not a catastrophe. The question only asks which one is bigger. If we're clever,
we can answer that without ever knowing how much the momentum or the energy
actually is. We know that both baseballs have the same mass, so let's just call it
' M ' and not worry about what it really is.

<u>Momentum of anything = (mass) x (speed)</u>
Momentum of the first baseball = (M) x (4 m/s) = 4M
Momentum of the second one = (M) x (16 m/s) = 16M
The second baseball has 4 times as much momentum as the first one has.

<u>Kinetic energy of anything = 1/2 (mass) x (speed squared)</u>
KE of the first baseball = 1/2 (M) x (4 squared) = 8M
KE of the second one = 1/2 (M) x (16 squared) = 128M
The second baseball has 16 times as much kinetic energy as the first one has.

3 0

4 years ago

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ki77a [65]

Answer:

$\boxed {\boxed {\sf 15 \ m/s \ or \ 15 \ m*s^{-1}}}$