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3 years ago

A straight line with a positive slope on a velocity-time graph indicates which of the following?

Physics

1 answer:

V125BC [204]3 years ago

4 0

Answer:

constant acceleration

Explanation:

I may be wrong, but I'm almost positive cuz I am also taking physics. ;)

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an ice skater, standing at rest, uses her hands to push off against a wall. she exerts an average force on the wall of 120 N and

natulia [17]

Answer:

The skater's speed after she stops pushing on the wall is 1.745 m/s.

Explanation:

Given that,

The average force exerted on the wall by an ice skater, F = 120 N

Time, t = 0.8 seconds

Mass of the skater, m = 55 kg

It is mentioned that the initial sped of the skater is 0 as it was at rest. The change in momentum of skater is :

$\Delta p=m(v-u)\\\\\Delta p=mv$

The change in momentum is equal to the impulse delivered. So,

$J=\Delta p=F\times t\\\\mv=F\times t\\\\v=\dfrac{Ft}{m}\\\\v=\dfrac{120\times 0.8}{55}\\\\v=1.745\ m/s$

So, the skater's speed after she stops pushing on the wall is 1.745 m/s.

4 0

3 years ago

Analyze the impact of each of the six aspects of health (physical ,social emotional ,mental ,spiritual ,and environmental )in yo

aliya0001 [1]

Answer:

Thats for your life, not ours.

Explanation:

4 0

3 years ago

If a peregrine falcon dove at its maximum speed for half a mile to catch prey, how many seconds would the dive take? (round your

Natasha2012 [34]

The number of seconds that the dive will take if peregrine falcon dove at its maximum speed for half a mile is 9 seconds.

<h3>How to calculate the time?</h3>

From the complete information, it was stated that the peregrine falcon can reach speed of up to 200 miles per hour.

Therefore, the number of seconds that the dice would take for half a mile will be calculated thus:

1 hour = 200 miles

3600 seconds = 200 miles

1 second will be: = (200/3600) = 0.056 miles

Therefore, the time will be:

200miles / 1 hour = 0.x

x = 0.0025 hours

Therefore, 0.0025 hours will be:

= 0.0025 × 3600

= 9 seconds.

Learn more about time taken on:

brainly.com/question/4931057

7 0

2 years ago

17. A microphone of surface area 2.0 cm’ absorbs 1.1 mW of sound. What is the intensity

Oxana [17]

Answer:

$I=0.055\ W/m^2$

Explanation:

Given that,

A microphone of surface area 2.0 cm’ absorbs 1.1 mW of sound.

Surfrace area, A = 2 cm = 0.02 m

Power absorbed, P = 1.1 mW = 0.0011 W

We need to find the intensity of sound hitting the microphone. Power per unit area is called the intensity of sound. It can be given by :

$I=\dfrac{P}{A}\\\\=\dfrac{0.0011\ W}{0.02\ m^2}\\\\=0.055\ W/m^2$

So, the intensity of sound is $0.055\ W/m^2$ . Hence, the correct option is (b).

3 0

3 years ago

As a protest against the umpire's calls, a baseball pitcher throws a ball straight up into the air at a speed of 19.0 m/s. In th

andrew11 [14]

Answer:

$F_{player}=26.1N$

Explanation:

Given data

Initial speed vi=0 m/s

Final speed vf=19.0 m/s

Δy=1.10 m

Mass of ball m=0.150 kg

To find

Force

Solution

First we need to find acceleration of the ball.So we can apply:

vf²=vi²+2aΔy

vf²=0+2aΔy

$a=\frac{(19.0m/s)^2}{2*1.10m}\\ a=164.1m/s^2$

Because we get the acceleration of the ball.We can now find the force the players exerts on the ball by using Newtons second law

∑F=F.player -mg=ma

$F_{player}-mg=ma\\F_{player}=mg+ma\\F_{player}=m[g+a]\\F_{player}=0.150kg[9.81+164.1]\\F_{player}=26.1N$

6 0

3 years ago