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Anika [276]
3 years ago
6

A golf ball rolls off a horizontal cliff with an initial speed of 11.4 m/s. The ball falls a vertical distance of 17.7 m into a

lake below. (a) How much time does the ball spend in the air? (b) What is the speed v of the ball just before it strikes the water?
Physics
1 answer:
Paladinen [302]3 years ago
8 0

Answer:

time is 1.90 second

speed is 21.83 m/s

Explanation:

given data

initial speed u = 11.4 m/s

distance s = 17.7 m

to find out

time and speed

solution

we know formula for time that is

time = √2S/g     .........................1

here s is distance so put all value

time = √2(17.7)/9.8

time = 1.90 second

and

for speed formula is

speed = √(u1²+u2²)    .........................2

here horizontal velocity  u1 = 11.4 m/s

and vertical velocity u2 = gt = 9.8×1.90 = 18.62 m/s

so from equation 2

speed = √(u1²+u2²)

speed = √(11.4²+18.62²)

speed = 21.83 m/s

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An amateur player is about to throw a dart with an initial velocity of 15 meters/second onto a dartboard that is at a distance o
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Answer:

B. 0.16 m

Explanation:

The vertical distance by which the player will miss the target is equal to the vertical distance covered by the dart during its motion.

Since the dart is thrown horizontally, the initial vertical velocity is zero:

v_y = 0

While the horizontal velocity is

v_x = 15 m/s

The horizontal distance covered is

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Since the dart moves by uniform motion along the horizontal direction, the time it takes for covering this distance is

t=\frac{d_x}{v_x}=\frac{2.7 m}{15 m/s}=0.18 s

along the vertical direction, the motion is a uniformly accelerated motion with constant downward acceleration g=9.8 m/s^2, so the vertical distance covered is given by

d_y = \frac{1}{2}gt^2=\frac{1}{2}(9.8 m/s^)(0.18 s)^2=0.16 m

8 0
3 years ago
1. A ball with a mass of 2.3 kg travels with a velocity of 10 m/s. What is it's kinetic energy?
monitta

Answer:

KE=½mv²

KE=½2.3kg×(10m/s)²

KE=½2.3kg×100m²/s²

KE=2.3kg×50m²/s²

KE=115joules

7 0
2 years ago
A bicycle is traveling north at 5.0 m/s. The mass of the wheel, 2.0 kg, is uniformly distributed along the rim, which has a radi
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Answer:2

Explanation:

Given

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radius of rim r=20 cm

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L=0.08\times 25=2kg-m^2/s  

direction of Angular momentum will be towards west

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