(Exam 1) PHY100 REVIEW (1)

10⁴

If you start with the number 3.0 and move the decimal point one unit to the left, you wind up with 0.30. If you move the decimal point a total of four units to the left, the result is the same as that of dividing the original number by:

5 m/s²

In order to go from rest to 100 m/s in 20 s, a jet must be able to accelerate at:

S = 10T

In which of these relations will S double if T is doubled?

40 ft/s

Initially you are driving at 55 mi/hr. If you come to rest in 5.0 s while traveling 200 ft, your average speed is:

Centimeter

The metric unit most comparable in size to the English inch unit is the:

2.0 s

A 10 kg object dropped from a certain window strikes the ground in 2.0 s. Neglecting air resistance, a 5 kg object dropped from the same window strikes the ground in:

Zero

A 100 pound sack of potatoes falls from an airplane. As the velocity of the falling sack increases, so does the air resistance on it. When the air resistance equals 100 pounds, the acceleration of the sack will be:

9.8 m/s

A ball is allowed to drop from rest. After 1 second its velocity will be:

2 s

A ball is projected upward with an initial velocity of 20 m/s. It will reach its maximum height in approximately:

-5 m/s²

A car is traveling at the velocity of 20 m/s on a flat road when it reaches the bottom of a hill. It coasts up the hill, coming to rest in 4 seconds. The average acceleration of the car while on the hill is:

instantaneous velocity from the slope of the graph.

A car rolls down an incline starting from rest. A graph of position versus time is made for this motion. One can get the:

53.3 km/h

A car travels a distance of 80 km. For the first 30 minutes it is driven at a constant speed of 80 km/h. The motor begins to vibrate and the driver reduces the speed to 40 km/h for the rest of the trip. The average speed for the entire trip is:

10 ✕ 10⁶ dollars

A certain building is sold for 10 Megadollars. What is the correct scientific notation for this selling price?

50 kg (490÷9.8)

A parachutist jumping from an airplane reaches a terminal velocity when the force of air resistance is 490 N. The mass of the parachutist is:

82.5 m (75÷100)

A scout steps off a distance of 110 steps. If each step is 75 cm, what is the distance in meters?

0.25 m/s²

A student releases a ball from rest on an inclined plane and measures that it travels a distance of 0.5 m in a time of 2.0 s. The acceleration of the ball is:

0.25 m/s (.5÷2)

A student releases a ball from rest on an inclined plane and measures that it travels a distance of 0.5 m in a time of 2.0 s. The average speed of the ball is:

one quarter as large

According to Newton's Law of Gravitation, if the distance between two bodies is doubled the attractive force between them becomes: a) twice as large. b) four times as large. c) one quarter as large. d) half as large. e) unchanged.

4.9 m

After 1 second, a ball dropped from rest will have fallen:

Zero

An auto moves 10 meters in the first second of travel, 10 more meters in the next second and 10 meters during the third second. The acceleration of the auto in m/s² is:

25 s (2,000÷80)

An auto, starting from rest, undergoes constant acceleration and covers a distance of 1000 meters. The final speed of the auto is 80 meters/sec. How long does it take the car to cover the 1000 meters?

122 m

An iron vise falls from rest at a great height. Neglecting air resistance, what distance has it fallen in the first 5 seconds?

2 kg (20÷10)

An object weighs 20 Newtons on Earth. What is its approximate mass?

The point at which air resistance on a falling object equals the the gravitational force, producing a net force of zero, which ends the object's acceleration. Te object will continue down the constant velocity.

Define: TERMINAL VELOCITY

Velocity versus time

For a body moving with constant acceleration, which of the following graphs will be a straight line? a) Velocity versus time. b) Displacement versus time. c) Displacement versus velocity. d) Velocity versus displacement. e) Time versus displacement.

at the same time as the Volkswagen.

Neglecting friction, if a Cadillac and Volkswagen start rolling down a hill together, the heavier Cadillac will get to the bottom:

2.54 ✕ 10⁻² meters.

One inch is defined as 2.54 centimeters. The correct expression for a one-inch length, expressed in meters, is:

1,000 or, 10³

Suppose that as it develops, a raindrop's diameter changes from one micrometer to one millimeter. Its diameter has increased by a factor of

39.2 m/s (49-9.8)

Suppose you throw a ball vertically upward with a speed of 49 m/s. Neglecting air friction, what would be the speed of the ball one second later?

Velocity versus time.

The acceleration of a body is given by the slope of a graph plotting:

A

Which of the curves in the figure best shows the speed of an object falling from rest without air friction? A, B, or C?

mass

Which of the following is NOT a vector? a) weight b) velocity c) acceleration d) mass

Curve D

You know that a quantity S will double whenever the quantity T is doubled. Which curve on the following plot correctly expresses this relationship?

velocity is zero and the acceleration is downward

You toss a ball straight up in the air. At the highest point, the ball's: