PSC Exam 1 and 2 questions with
verified answers already passed
How do velocity and acceleration differ? - correct answer ✔✔acceleration is the rate of change
of velocity, while velocity is the rate of change of displacement
Which of the following is the most important factor determining if a claimed event is indeed
reality? - correct answer ✔✔
IF you throw a tennis ball vertically upward, during the time it is in the air, is its speed ever zero?
is its acceleration ever zero? - correct answer ✔✔yes; no
The relations among units in the British system of units are arbitrary. The relations among units
in the International system (metric system) of units have a simple pattern - correct answer
✔✔true; true
An object is dropped from a height. After 4 seconds, how much distance has it travelled? -
correct answer ✔✔d= vot + 1/2at^2
g= 10 m/s^2
80 meters
Speed is a ______ and velocity is a _____. Speed refers to the _____ of the velocity. - correct
answer ✔✔number; vector; magnitude
On the surface of the moon, you will have - correct answer ✔✔the same mass but less weight
One of keplers laws relates the period T of a planet to the size R of its orbit. In particular,
, T^2 = constant X R^3
OR
T= constant square root of R^3
The constants have a value but these values are not important
Now assume that it takes mars 2 years to go around the sun. Given the above law, if Mars was 4
times further from the sun, how long would its period be? - correct answer ✔✔
When you are standing up, if m is your mass, then the normal force from the floor on you
equals - correct answer ✔✔2mg
your weight is the force which Earth's mass pulls on your mass. The force with which your mass
pulls on Earth's mass is - correct answer ✔✔equal to your weight
halley's comet moves on a closed orbit and visits our neighborhood every 76 years. Therefore,
according to what we know about the orbits of the celestial objects, its orbit is - correct answer
✔✔an ellipse
As you walk along a level floor, the friction force acting on your feet points... - correct answer
✔✔in the direction of your motion
Two ice skaters are standing still on a frictionless surface close together facing each other. Skater
1, whose mass is twice that of skater 2, pushes on skater 2 and the two glide away from each
other. Which skater felt the larger force? - correct answer ✔✔They each felt the same force
Two ice skaters are standing still on a frictionless surface close together facing each other. Skater
1, whose mass is twice that of skater 2, pushes on skater 2 and the two glide away from each
verified answers already passed
How do velocity and acceleration differ? - correct answer ✔✔acceleration is the rate of change
of velocity, while velocity is the rate of change of displacement
Which of the following is the most important factor determining if a claimed event is indeed
reality? - correct answer ✔✔
IF you throw a tennis ball vertically upward, during the time it is in the air, is its speed ever zero?
is its acceleration ever zero? - correct answer ✔✔yes; no
The relations among units in the British system of units are arbitrary. The relations among units
in the International system (metric system) of units have a simple pattern - correct answer
✔✔true; true
An object is dropped from a height. After 4 seconds, how much distance has it travelled? -
correct answer ✔✔d= vot + 1/2at^2
g= 10 m/s^2
80 meters
Speed is a ______ and velocity is a _____. Speed refers to the _____ of the velocity. - correct
answer ✔✔number; vector; magnitude
On the surface of the moon, you will have - correct answer ✔✔the same mass but less weight
One of keplers laws relates the period T of a planet to the size R of its orbit. In particular,
, T^2 = constant X R^3
OR
T= constant square root of R^3
The constants have a value but these values are not important
Now assume that it takes mars 2 years to go around the sun. Given the above law, if Mars was 4
times further from the sun, how long would its period be? - correct answer ✔✔
When you are standing up, if m is your mass, then the normal force from the floor on you
equals - correct answer ✔✔2mg
your weight is the force which Earth's mass pulls on your mass. The force with which your mass
pulls on Earth's mass is - correct answer ✔✔equal to your weight
halley's comet moves on a closed orbit and visits our neighborhood every 76 years. Therefore,
according to what we know about the orbits of the celestial objects, its orbit is - correct answer
✔✔an ellipse
As you walk along a level floor, the friction force acting on your feet points... - correct answer
✔✔in the direction of your motion
Two ice skaters are standing still on a frictionless surface close together facing each other. Skater
1, whose mass is twice that of skater 2, pushes on skater 2 and the two glide away from each
other. Which skater felt the larger force? - correct answer ✔✔They each felt the same force
Two ice skaters are standing still on a frictionless surface close together facing each other. Skater
1, whose mass is twice that of skater 2, pushes on skater 2 and the two glide away from each
