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EastWind [94]
3 years ago
10

Explain why the speed of a sled is increases as it moves down a snow -covered hill, even though no one is pushing the sled

Physics
1 answer:
Andrews [41]3 years ago
6 0
Hope this helps you.

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A ball of mass 0.05 kg strikes a smooth wall normally four times in 2 second with a velocity of 10m/s. Each time the ball reboun
asambeis [7]

Answer" The average force on the wall be equal to 0.5 N.

Explanation:

To calculate the average force on the wall, we use the following equation:

Ft=m\Delta v\\\\F=\frac{m(v_2-v_1)}{t}

where,

F = average force = ?N

m = mass of the ball = 0.05kg

v_1 = Initial velocity of the ball = -10m/s (negative sign because the ball rebounds)

v_2 = Final velocity of the ball = 10m/s

t = time taken by the ball = 2s

Putting values in above equation, we get:

F=\frac{0.05kg[10-(-10)]m/s}{2s}\\\\F=\frac{0.05kg(20m/s)}{2s}\\\\F=0.5kgm/s^2=0.5N

Hence, the average force on the wall will be equal to 0.5N.

3 0
3 years ago
A lightweight string is wrapped several times around the rim of a small hoop. If the free end of the string is held in place and
MariettaO [177]

Answer:

Explanation:

Let T be the tension

For linear motion of hoop downwards

mg -T = ma , m is mass of the hoop . a is linear acceleration of CG of hoop .

For rotational motion of hoop

Torque by tension

T x R ,      R is radius of hoop.

Angular acceleration be α,

Linear acceleration a = α R

So TR = I  α

= I  a / R

a = TR² / I

Putting this value in earlier relation

mg -T = m TR² / I

mg = T ( 1 + m R² / I )

T = mg / ( 1 + m R² / I )

mg / ( 1 + R² / k² )

Tension is less than mg or weight because denominator of the expression is more than 1.

5 0
3 years ago
How is capacitance related to the distance between the plates of a capacitor?
svetlana [45]

Answer:C

Explanation: I studied, and C is correct

5 0
3 years ago
A characteristic in an experiment, such as how much food, how much space, how hot or how cold, is termed a ____________. (spelli
KATRIN_1 [288]
I think the term is a variable?
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If the Coast Guard warns of a giant wave of water approaching the shore as a result of a major earthquake, they are warning of
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The answer is A Tsunami
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