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natali 33 [55]
3 years ago
10

A 0.060-kg ice hockey puck comes toward a player with a high speed. The player hits it directly back softly with an average forc

e of 1.50 x 10^3 N. The hockey stick is in contact with the ball for 1.20 ms, and the ball leaves the stick with a velocity of 8.00 m/s. Let the direction of the force be the + x direction. Find the following (note: be careful with the sign/direction of the values):_______. 1. The final momentum of the ball 2. The impulse on the ball 3. The initial velocity of the ball
Physics
1 answer:
kramer3 years ago
8 0

Answer:u=-22 m/s

Explanation:

Given

mass of puck m=0.06\ kg

Average force f_{avg}=1.5\times 10^3\ N

time of contact t=1.2ms=1.2\times 10^{-3}\ s

puck leaves with a velocity of v=8\ m/s

We know impulse is F_{avg}\Delta t=\text{change in momentum}

therefore

1.5\times 10^3\times (1.2\times 10^{-3})=P_f-P_i

P_i=0.06\times 8-1.8

P_i=0.48-1.8=-1.32\ kg-m/s

Final momentum P_f=m\times v_f

P_f=0.06\times 8

P_f=0.48\ kg-m/s

Impulse on the ball =F_{avg}\Delta t

Impulse=1.5\times 10^3\times 1.2\times 10^{-3}=1.8\ N-s

Initial velocity is given by

u=\frac{P_i}{m}=\frac{-1.32}{0.06}

u=-22\ m/s

i.e. initially ball is moving towards -x-axis

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8 0
2 years ago
A car is strapped to a rocket (combined mass = 661 kg), and its kinetic energy is 66,120 J.
aliina [53]

Answer:

9.43 m/s

Explanation:

First of all, we calculate the final kinetic energy of the car.

According to the work-energy theorem, the work done on the car is equal to its change in kinetic energy:

W=K_f - K_i

where

W = -36.733 J is the work done on the car (negative because the car is slowing down, so the work is done in the direction opposite to the motion of the car)

K_f is the final kinetic energy

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Solving,

K_f = K_i + W = 66,120 + (-36,733)=29,387 J

Now we can find the final speed of the car by using the formula for kinetic energy

K_f = \frac{1}{2}mv^2

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v is its final speed

Solving for v, we find

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3 0
3 years ago
Why does the large number of hydrogen atoms in the universe suggest that other elements?
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Answer:

Explanation:

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The abundance of chemical elements in the universe is dominated by the large amounts of hydrogen and helium which were produced in the Big Bang. Remaining elements, making up only about 2% of the universe, were largely produced by supernovae and certain red giant stars. Lithium, beryllium and boron are rare because although they are produced by nuclear fusion, they are then destroyed by other reactions in the stars.[1][2] The elements from carbon to iron are relatively more abundant in the universe because of the ease of making them in supernova nucleosynthesis. Elements of higher atomic number than iron (element 26) become progressively rarer in the universe, because they increasingly absorb stellar energy in their production. Also, elements with even atomic numbers are generally more common than their neighbors in the periodic table, due to favorable energetics of formation.

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Answer:

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Explanation:

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