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MArishka [77]
3 years ago
10

A mis-hit golf ball flies straight upward. It reaches a height of 31.0 meters before falling back down. How fast was it going wh

en it was hit? (Assume you can ignore drag)
Physics
1 answer:
Tema [17]3 years ago
5 0

At the top most position when ball reach to height 31 m

The speed of the ball must be ZERO

now we can use kinematics to find the final speed of the ball when it will hit back the ground

the equation of kinematics will be

v_f^2 - v_i^2 = 2 ad

v_f^2 - 0^2 = 2(9.8)(31)

v_f^2 = 607.6

v_f = 24.65 m/s

so it will hit the ground at speed 24.65 m/s

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Calculate the mass of an 86kg object on the moon
Vikentia [17]
If an object that is 86kg on the moon then that is the answer, 86kg.
3 0
3 years ago
A Fleas can jump up a distance as large as 33 cm horizontally in a single leap (they are only 0.3 mm in size!). What is their la
Alex Ar [27]

Answer:

Launch velocity of the fleas = 1.80 m/s

Explanation:

Optimal launch angle is the angle that guarantees the maximum horizontal distance covered.

Optimum launch angle = 45°

The horizontal distance covered by a projectile is given as Range

R = (u² sin 2θ)/g

u = initial velocity of the projectile (flea) = ?

R = range = 33 cm = 0.33 m

θ = 45°

2θ = 2 × 45° = 90°

Sin 90° = 1

g = acceleration due to gravity = 9.8 m/s²

R = (u²/g)

u² = Rg = 0.33 × 9.8 = 3.234

u = 1.80 m/s

Hope this helps!!!

7 0
3 years ago
Describe an experiment to show that pressure increases with the decrease in the area of surface
cluponka [151]
Answer:
press a baloon against one pin it bursts
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7 0
3 years ago
Jet streams can form near Earth’s surface as well. One such jet develops just above the central plains of the United States, whe
Crazy boy [7]

Answer:

Low level jet

Explanation:

Jet streams can also form close to the earth's surface. of all such type of jet one jet  grows just over the main central plains of  United States, where speeds approaching 60 knots are rarely reached. This high point wind speed jet is recognised as low level jet, which typically comes from south or southwest.

As title indicates, , it termed as a rapidly-moving stream of air in low atmosphere levels .

6 0
3 years ago
HELP!!
Otrada [13]

Answer:

22 N

Explanation:

The box is moving, so there is kinetic friction.

The speed is constant, so there is no acceleration.

Draw a free body diagram of the box.  There are four forces.

Normal force Fn pushing up.

Weigh force mg pulling down.

Applied force F pushing right.

Friction force Fn μk pushing left.

Sum the forces in the y direction:

∑F = ma

Fn − mg = 0

Fn = mg

Sum the forces in the x direction:

∑F = ma

F − Fn μk = 0

F = Fn μk

F = mg μk

F = (11.2 kg) (9.8 m/s²) (0.200)

F = 22.0 N

3 0
3 years ago
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