physics

A golf ball is hit horizontally off the edge of a 30 m high cliff and lands a distance of 25 m from the edge of the cliff. What was the initial vertical velocity of the ball?

0 m/s

A player kicks a football from ground level with a velocity of magnitude 27.0 m/s at an angle of 30∘ above the horizontal. What is the time the ball is in the air?

2.8 s

A tennis ball is hit with an initial velocity of 15 m/s at an angle of 40°. What is the horizontal distance of the ball after 2 seconds? (round to the nearest meter)

23 m

A stone is thrown horizontally at a speed of 8.0 m/s from the edge of a cliff 80 m in height. How far from the base of the cliff will the stone strike the ground?

32 m

A cannon is fired from the edge of a small cliff. The height of the cliff is 80.0 m. The cannonball is fired with a perfectly horizontal velocity of 80.0 m/s. How far will the cannonball fly horizontally before it strikes the ground?

320 m

Albert throws a ball horizontally off the top of a building 80.0 meters above the ground. If air resistance is negligible, how much time will it take the ball to hit the ground? Use significant figures, and estimate g to be equal to 9.81 m/s². Round the answer to the nearest hundredth.

4.0385 seconds ?

A car weighing 12,000 N is parked on a 36∘slope. The car starts to roll down the hill. What is the acceleration of the car?

5.8 m/s^2

A player kicks a football from ground level with a velocity of magnitude 27.0 m/s at an angle of 30∘above the horizontal. What is the horizontal distance the ball travels?

64.4 m

A player kicks a football from ground level with a velocity of magnitude 27.0 m/s at an angle of 30∘above the horizontal. What is the maximum height of the ball?

9.30 m

A projectile is fired horizontally with a velocity of 48 m/s from the hill 294 m high. Find the time taken to reach the ground.

?

If a bullet is fired from a high power rifle at the exact time a duplicate bullet is dropped by hand near the barrel of the rifle, which bullet will hit the ground first?

Both will hit the ground at the same time.

The force of gravity acting on an object is directed through this center of gravity and toward the center of the __________.

Earth

For an angular projectile that is at 69 degrees with the ground, the horizontal range is at its highest.

FALSE

If a bullet is fired from a high power rifle at the exact time a duplicate bullet is dropped by hand near the barrel of the rifle, the fired bullet will reach the ground first.

FALSE

The horizontal component of velocity of a projectile changes throughout the motion.

FALSE

In projectile motion the vertical velocity remains constant but horizontal velocity keeps on increasing.

False

Suppose that a ball is released from the window of a train that is moving with a constant velocity. The path of the ball, as observed from the train window, will be a horizontal straight line.

False

_____________ is the force that causes an object to have a curved path during projectile motion.

Gravity

Types of projectiles are:

Horizontal and angular

Neglecting air resistance, what would happen if you were a passenger in a convertible automobile traveling at a constant velocity and threw a ball straight up in the air?

It would land in the car.

A cricket ball is hit at 60 degree horizontally with a kinetic energy K. What is the kinetic energy of the ball at the highest point?

K/4

Pick the correct word to fill up the blank in below question: vertical, parallel, perpendicular, horizontal ________________components of vectors do not influence each other.

Perpendicular

_______________ motion is the movement of an object in a curved path toward the ground.

Projectile

A bomb dropped from an airplane and a ball thrown at a particular angle are examples of projectile motion.

TRUE

A cannonball shot from a cannon has projectile motion.

TRUE

A projectile is an object moving in the air under the effect of gravity alone.

TRUE

An object with projectile motion constantly changes direction.

TRUE

Every object has a center of gravity.

TRUE

Knowledge of projectile motion might help you aim a basketball when you throw it so it is more likely to go into the basket.

TRUE

Suppose that a ball is released from the window of a train that is moving with a constant velocity. The path of the ball, as observed from the ground, will be parabolic.

TRUE

How does the time a projectile spends traveling upward compare with the time the same projectile spends returning to the Earth?

The times are equal

Joe Nedney of the San Francisco 49ers kicked a field goal with an initial velocity of 20 m/s at an angle of 60∘ and the ball is in the air for 3.5 s. Therefore, the range of the ball is 35 m.

True

Projectile motion is described in terms of ______________.

acceleration, velocity, position

Complete the sentence below using one of the following words: equilibrium, flux, motion. If supported at its center of gravity, an object will remain in ______________ in any position.

equilibrium

The center of ____________ is the point at which the entire weight of a body may be considered to be concentrated.

gravity

Pick the correct word to answer the below question: linear, trajectory, parabola, hyperbola, parallel What common conic section is created by the motion of a projectile launched at an angle under the influence of gravity?

parabola

Complete the sentence using word parallel, perpendicular or sixty degrees. The normal force is always ____________ to the surface.

perpendicular

Pick the correct word to fill up the blank in below question: curves, injectors, launchers, projectiles Objects that are launched into the air are ___________.

projectiles

Pick the correct word to fill up the blank in below question: projection, parabola, hyperbola, trajectory, linear The path followed by a projectile in motion is its _____________.

trajectory

The __________ of an object is a vector that is directed toward the center of the Earth.

weight