Physics exam one

The text uses SI units. What does S and the I stand for?

Systems international

Complete the following statement, the standard meter is defined in terms of the speed of the light because

The speed of light is a universal constant

Which of the following pairs of units may not be added together even after appropriate unit conversion

Seconds and slugs

Which of the following choices is equivalent to 44.5 mm

4.45×10^-2nd m

What is the difference between distance and displacement?

Displacement is a vector while distance is not a vector

Complete the following statement displacement is

A vector indicating the distance and direction from one point to another

A jogger runs along the straight line and level Road for a distance of 8.0 KM and then runs back to her starting point the time for this round-trip is two hours which of the following statements is true

Her average speed is 8KM per hour in her average velocity is zero KM per hour

A boat moves 3KM do north and then moves 1KM do south the Trip time is a half an hour. What is the average velocity of the boat?

4.0 KM per hour due north

A motorcycle travels do south covering a total distance of 80 km and 60 minutes which of the following statements concerning the situation is true

The average velocity of the motorcycle is 80 km/h due south

Which of the following quantities is defined as an object displacement divided by the lapse time for the displacement

Average velocity

Complete the following statement the difference between speed and velocity is

Velocity has a direction speed does not

For which of the following situations will the path length equal the magnitude of the displacement?

A ball is rolling down an inclined plane

Peter notices a bug crawling along a meter stake decided to record the books position in five second intervals after their bug crawled off the meter stake Peter created a table shown what is the displacement of the bug between T 0 seconds and T 20 seconds

16.1 cm

Of the five kinematic variables, how many must be known before the equations of kinematics can be determined the unknown variables and a problem that deals with a single moving object

Three

What constant acceleration would a car from starting from rest have to sustain an order to reach the velocity of 27 m/s due east in three seconds

9 m/s due east

A rock is released from rest from the top of a ladder, which is 2 m above the ground if we ignore air resistance as the rock falls, which of the following is true

The rock is considered a free falling body after it is released

Ping-pong ball a is filled with sand ping-pong ball B is identical, except it is empty inside ballet is heavier than pee because of the sand inside both balls are dropped from rest at the top of a building. Which of these two balls has a greater acceleration to gravity, if any as they fall.

Ball A and B have the same acceleration

A ball is thrown vertically upward from a surface of the earth consider the following which of these are at zero when the ball reaches maximum height

The speed of the ball and the velocity of the ball

A ball has dropped from rest from a tower and strikes the ground 110 m below. How many seconds does it take the ball to strike the ground after being dropped

4.74 seconds

Suppose you were driving do ease traveling a distance of 1500 m in two minutes. You then turn to north and travel the same distance in the same time what can be said about the average speeds in velocities of the two segments of this trip?

The average speeds are the same, but the velocities are different

A car travels due east at 22 m/s. It makes a turn due south and continues to travel at 22 m/s what is the change in the velocity of the car?

22 m/s due south

In a two dimensional motion in the XY plane, what is the relationship between the X part of the motion and the Y part of the motion?

The X part of the motion is independent of the Y part of the motion

A object is thrown upward at a angle theta above the ground eventually returning to earth what statement is true

The velocity and acceleration are perpendicular only at the top of the trajectory

Two bowls are thrown from the top of a building ball. One is thrown straight down in ball two is thrown with the same speed but upward at an angle with respect to the horizontal, consider the motion of the balls after they are released, which of the following statements is true

Both balls are the same acceleration at all times

Ball one is thrown into the air, and it flows the trajectory for projectile motion shown in the drawing at the instant is at the top of its trajectory while he has dropped from rest at the same height which ball hits the ground first

Both balls reached the ground at the same time

A car has a mass of 16,000 kg is stuck in the snow and is being pulled out by a cable that applies a force of 7560 N do north the resistance of the snow and mud also apply a force to the car which has a magnitude of 7340 N in points due south what is the acceleration of the car?

0.14 m/s north

What unit is defined by 1 m/s squared acceleration of a 1 kg object

Newton

Complete the following statement, the net force that results when two or more forces act on an object is

Determined by adding the magnitude to the individual forces in the direction of the net force is the same as direction of the motion

When the net force acts on a hockey puck, it is 12 N the puck accelerates at a rate of 48 m/s squared determine the mass of the puck

0.25 kg

A 975 kg car accelerates from rust to 26.7 m/s in a distance of 120 m what is the magnitude of the average net force acting on the car?

2900 N

A stack of books who’s true weight is 165 Newton is placed on a scale in an elevator. The scale reads 165 N from this information alone. Can you tell whether the elevator is moving with a constant velocity of 2 m/s upwards isn’t moving at a constant velocity of 2 m/s downwards or is it at rest

No, you cannot tell

A 10 kg suitcases placed on a scale that is in an elevator in which direction is the elevator accelerating when the scale reads 75 N and when it reads 120 N

Downward when it reads 75 and upward when it reads 120

Two forces act on a 4.5 kg block resting on a frictionless surface. What is the magnitude of the horizontal acceleration of the block?

1.8 m/s

A heavy block is suspended from a ceiling, using pulleys in three different ways ranked tensions of the rope that passes over the pulley and ascending order smallest first

B,C,A

Under what conditions will an object be equilibrium?

If it is either at rest or moving with a non-0 constant velocity