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solong [7]
3 years ago
10

An object dropped from a height of 2 meters would have {Less/ More/ Same} kinetic energy when it hits the ground than an object

dropped from a height of 5 meters due to the fact that its velocity {Less/ More/ Same} as it falls.
Physics
1 answer:
vredina [299]3 years ago
5 0

Answer:

Explanation:

Impossible to say as we have no relationship between the masses of the object dropped from 2 meters as compared to the object dropped from 5 meters.

If the two masses are identical, the 5 meter drop will leave its mass with a greater kinetic energy because it has greater velocity.

mgh = ½mv²

v = √(2gh)

The kinetic energies could be identical if

m₁g(2) = m₂g(5)

m₁ = 2.5m₂

if m₁ > 2.5m₂ then m₁ will have more kinetic energy falling from 2 m than m₂ has from falling 5 m even though the higher drop distance will give that mass more velocity.

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I think I know this one but I don’t at the same time
galben [10]

Answer: B.) 6

Explanation:

To answer this problem you get the number of students who attended Wednesday (18) and the number of students who attended Tuesday (12) and subtract 18 - 12 = 6

Answer = B.) 6

8 0
3 years ago
How much power is needed to lift a 20-kg object to a height of 4.0 m in 2.5 seconds?
4vir4ik [10]

Answer:

313.92w

Explanation:

Formula for power:

P=W/∆t = Fv

Givens:

m=20kg

∆y=4.0m

∆t=2.5s

a=9.81m/s²

In order to find power, we first need to solve for work.

W=Fd (force*displacement), f=mg

W=mg∆y

W=(20kg)(9.81m/s²)(4.0m)

W=784.8J

P=W/∆t

P=784.8J/2.5s

P=313.92 watts

5 0
3 years ago
A balloon filled with helium has a small hole on the right side of the balloon. How would Pascal explain why the entire balloon
Morgarella [4.7K]

Answer:

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4 0
3 years ago
A book sits on a bookshelf without moving until a student picks it up. Which law best explains why the book remains at rest unti
svetoff [14.1K]

Answer:

Newtons first law

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8 0
3 years ago
The ms = 0.5645 and mk=0.1113 for a 30 N box on level ground. What level force is needed to start the box moving
nevsk [136]

Answer:

16.935 N

Explanation:

In order to make the box start moving, the level force applied on the box (F) must be greater than the force of static friction that keeps the box at rest, which is equal to

F_f = \mu_s (mg)

where

\mu_s = 0.5645 is the coefficient of static friction

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Therefore, the condition for F must be:

F \geq F_f\\F \geq \mu_k (mg)=(0.5645)(30 N)=16.935 N

So, the applied force must be greater than this value.

3 0
4 years ago
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