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3 years ago

A force acting on a moving ball causes its motion to change. This force stays constant.

Physics

1 answer:

sashaice [31]3 years ago

8 0

Answer:

you stop the ball or bring it to a different direction

Explanation:

i don't know if this helps. i didn't take physics yet. but i hope this helps.

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A rock is dropped off a cliff and falls the first half of the distance to the ground in t1 seconds. If it falls the second half

Hitman42 [59]

Answer:

$t2/t1 = \sqrt{2} - 1$

Explanation:

The expression for the second law of motion is given below:

h = $ut + 0.5at^2$

<u>For first half distance</u>

Object is initially at rest, so its initial speed u = 0

Object falls at half the distance, so h = h/2 where t = t1

Hence, we have

$h/2 = at1^2/2 - equation 1$

<u>For second half distance: </u>

Similarly,

$h = a(t1 + t2)^2/2 - equation 2$ where t = t1 + t2 and u= 0

Using equation 2 by equation 1

we obtain $2 = (t1 + t2)^2/t1^2$

Hence $t2/t1 + 1 = \sqrt{2}$

Hence $t2/t1 = \sqrt{2} - 1$

5 0

3 years ago

Jose is batting for the home team when he hits a foul ball that rises straight up over home plate. A fan in the stands notices t

andreyandreev [35.5K]

Answer:

Explanation:

Given maximum height reached by the ball as H = 40 metres

Since the ball rises straight up when hit by a ball, then the angle of launch will be perpendicular to the ground and that is 90°.

To determine the upward speed of the ball in meters per second after it got struck by the bat, we will use the formula for calculating the maximum height according to projectile motion;

Maximum Height H = $\frac{u^2sin^2\theta}{2g}$ where;

u is the speed of the ball

$\theta$ is the angle of launch

g is the acceleration due to gravity = 9.81m/s²

Substituting the given parameters into the formula;

$40 = \frac{u^2sin^2(90)}{2(9.81)}\\ \\40 = \frac{u^2}{2(9.81)}\\ \\40 = \frac{u^2}{19.62} \\cross\ multiply\\\\u^2 = 40*19.62\\u^2 = 784.8\\u = \sqrt{784.8}\\ u = 28.01 m/s$

<em>Hence the upward speed of the ball in meters per second after it got struck by the bat is 28.01m/s.</em>

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3 years ago

A person weighs 167 lb. The acceleration of gravity is 9.8 m/s 2 . Determine her weight in newtons and her mass in kilograms

sergejj [24]

Explanation:

Weight (N) = Mass * Acceleration

75.74 kg = Mass * 9.8 m/sec^2

Mass = 7.72 kg

Weight = 75.74 N

6 0

3 years ago

A light ray bounces off a fish in your aquarium. It travels

frutty [35]

Answer:

Correct

Explanation:

Because the light can't travel as quickly in the water as it does in the air, the light bends around the pencil, causing it to look bent in the water. Basically, the light refraction gives the pencil a slight magnifying effect, which makes the angle appear bigger than it actually is, causing the pencil to look crooked.

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3 years ago

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Limiting contact between gamma rays and healthy tissue is important because

ELEN [110]

It is because it damages the tissue and kills body cells. It could also lead to cancer.

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3 years ago

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