Physics Final Review

Can an object be moving when its acceleration is zero?

Yes

The purpose of an air bag in an auto is to

decrease the force applied to you during a collision.

Three charged objects. Object A rejects object B, object B attracts object C. List at least one possible combination of charges for A, B, and C

++- / --+

Which of the following is not an electromagnetic wave?

B. Sound

Magnetic fields affect

B. only electric charges in motion.

Two marbles, one of which is more massive than the other, are held at the same height above the ground. At the same time, the less massive marble is fired purely horizontal direction (like a bullet); the heavier marble is simply dropped. What happens (from below), and why? Neglect air resistance

Both marbles hit the ground at the same time; gravity accelerates all masses equally.

Which of the following is a unit for rotational velocity?

C. Rev/sec

According to Newton's Law of Gravitation, if the distance between two bodies is doubled the attractive force between them becomes

One quarter as large

An astronaut is taking a space walk when his tether breaks. He has a big drill. How can he get back to the space ship?

Turn his back to the ship and throw the drill forward

3. One airplane travels due north at 300 km/h while another travels due south at 300 km/h. Are their speeds the same? Are there velocities the same?

Yes/No

When a glass rod rubbed with silk acquires a positive charge, the silk acquires

a negative charge

The correct way to connect an ammeter and a voltmeter to make measurements of a circuit element is

an ammeter is always in series with the circuit element and a voltmeter is always in parallel with the circuit element

Two identical coils of wire are placed on a single horizontal wooden broom handle. The coils are separated by a few centimeters. We now run identical currents in the same direction through each coil. The coils experience

an attractive magnetic force.

5. The motion of a particle is described in the velocity versus time graph shown in the figure. We can say that its speed

decreases and then increases.

Compared to the huge force that attracts an iron tack to a strong magnet, the force that the tack exerts on the magnet is

equally huge

A ball is whirled on the end of a string in a horizontal circle at constant speed. Suddenly, the string breaks. Immediately after the string breaks, the ball will

have a horizontal velocity that is tangential to the circle.

If the distance between two spherical charged objects decreases by a factor of two, then the electrical force between the objects

increases by a factor of four

When the temperature of the air in a balloon is raised, the volume of the balloon

increases.

How do you charge an object without actually touching it?

induction

According to Archimedes' principle, the buoyant force on an object is

is equal to the weight of the displaced fluid.

1. Which of following units is a unit for speed?

m/min

23. In projectile motion the vertical component of the velocity at the top of the trajectory is

non-zero, and less than the initial vertical component of the velocity.

When white light passes through a prism, green light is bent more than

red light.

A car starts up from rest along a straight highway with an acceleration of 1 m/s2. A second car comes racing past at a steady 120 km/hr. Which car has the larger net force acting on it?

the first car

Three different resistances connected in parallel all have

the same potential difference

A ping-pong ball collides with a bowling ball. Which experiences the greatest force?

they experience the same force

A quantity which is conserved in the collision of a car and a truck is

total momentum.

When throwing a ball straight up, which of the following is true about its velocity and acceleration at the highest point in its path?

v = 0, a ≠ 0

When the bullet fired into the spiral tubes emerges, which path will it follow?

B (straight from direction of tube)

A ball is thrown straight up. It reaches its highest point and then falls back. Which of the following is the correct statement?

At the highest point in its motion, the ball's velocity is zero.

A box is pushed across a rough horizontal floor by a force acting parallel to the floor in the direction of motion. A force doing negative work on the body is

Friction

These two skaters original at rest have just pushed off against one another. One skater has twice the mass as the other. Which one will experience the greater momentum?

Neither, they both have the same

A horizontally moving positive sodium ion enters a magnetic field that points up. The magnetic force pushes the charge out of its original path. When viewed as shown on this page, what direction will the magnetic force point?

Out of the page