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3 years ago

A ball has a mass of 2 kg and is thrown with a force of 8 Newtons for .35 seconds. What is the ball's change in

Physics

1 answer:

Anna [14]3 years ago

6 0

Answer:

1.4s

Explanation:

Given parameters:

Mass of ball = 2kg

Force = 8N

Time = 0.35s

Unknown:

Change in velocity = ?

Solution:

To solve this problem, we use the expression obtained from Newton's second law of motion which is shown below:

Ft = m(v - u)

So;

Ft = m Δv

F is the force

t is the time

m is the mass

Δv is the change in velocity

8 x 0.35 = 2 x Δv

Δv = 1.4s

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A 18000 Hz wave has wavelength of 0.03 meters. How fast is this wave<br> traveling?

Alex Ar [27]

Answer:

540m/s

Explanation:

Given parameters:

Frequency of the wave = 18000Hz

Wavelength of the wave = 0.03m

Unknown:

How fast is the wave traveling = ?

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Speed of wave = frequency x wavelength

Now insert the given parameters and solve;

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3 years ago

A train is speeding down a railroad track at the speed of 50 miles per hour. From whose reference point is the train not moving?

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4 years ago

A football player punts the ball from the ground at a 65.0° angle above the horizontal. If the ball stays in the air for a total

maw [93]

Answer: $V_{0,x } = 297.7 \frac{m}{s}\\V_{0,y } = 637 \frac{m}{s}$

Explanation:

Hi!

We define the point (0,0) as the intial position of the ball. The initial velocity is $(V_{0,x}, V_{0,y})$

The motion of the ball in the horizontal direction (x) has constant velocity, because there is no force in that direction. :

$x(t) = V_{0,x}t$

In the vertical direction (y), there is the downward acceleration g of gravity:

$y(t) = -gt^2 + V_{0,y}t$

(note the minus sign of acceleration, because it points in the negative y-direction)

When the ball hits the ground, at t = 65s, y(t = 65 s) = 0. We use this to find the value of the initial vertical velocity:

$0 = t(-gt + V_{0,y})\\V_{0,y} = gt = 9.8 \frac{m}{s^2} 65 s = 637 \frac{m}{s}$

We used that g = 9.8 m/s²

To find the horizonttal component we use the angle:

$\tan(65\º) = \frac{V_{y,0}}{V_{x,0}} = 2.14\\V_{x,0} = 297.7\frac{m}{s}$

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3 years ago

The diagram below shows a transverse wave moving toward the right along a rope. At the instant shown, point P on the rope is mov

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Answer:

2. i think

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If the p were to keep moving it would go down then it would go up.

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3 years ago

What is true of electrolytic cells but is not true of galvanic cells?

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They are non-spontaneous

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4 years ago

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