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3 years ago

12

A runner completes the 300-meter dash in 38 seconds. What is the speed of the runner? Round your answer to the nearest tenth.The

answer would be in m/s

1 answer:

Galina-37 [17]3 years ago

7 0

The speed of the runner is 300 m /38 seconds. You can simplify this answer to be about 7.9 m/s

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27. Find the acceleration of a particle moving with a con-

barxatty [35]

Answer:

32 m/s²

Explanation:

Centripetal acceleration is:

a = v² / r

Given v = 8 m/s and r = 2 m:

a = (8 m/s)² / (2 m)

a = 32 m/s²

4 0

3 years ago

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

kramer

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

8 0

3 years ago

Manufacturers sometimes use science to make foods more nutritious. Food manufacturers can make reduced fat potato chips, besides

pogonyaev

All of the choices are correct.

5 0

3 years ago

Read 2 more answers

a rifle is used during the biathlon event in the Olympics the rifle has a mass of 2.5 kg the bullet has amass of 0.02 kg after t

Nataliya [291]

The momentum before is zero because nothing is moving. Note that because momentum is a conserved vector, the total momentum after the shot is also zero. You just have to add the products of mass and velocity in opposite directions. So the answer is zero

6 0

3 years ago

Read 2 more answers

Name the charged particles that can be transferred between certain materials when they

Irina18 [472]

Answer:

the charged particle is electron..

Explanation:

electrons are the only charged particles which can be transferred by rubbing certain materials which generate electrostatic force ...

8 0

2 years ago