physics

a satellite is in orbit around the earth. which one feels the greater force? a. earth and satellite feel the same force b. the satellite because the earth is so much more massive c. it depends on the distance of the satellite from earth d. the earth because the satellite has so little mass

Earth and satellite feel the same force

which of the following in NOT a contact force a. force of gravity b. normal force c. drag force d. fritction e. spring force

Force of Gravity

2 cars collide and stick together. which of the following is NOT conserved during collision a. total momentum b. total energy c. kinetic energy d. all are conserved e. none are conserved

Kinetic energy

which of newtons 3 laws of motion involves equal and opposite force pairs a. first b. second c. third d. none

Newtons 3rd law of motion

which of the following is not a vector quantity a. displacement b. velocity c. acceleration d. speed

Speed

a rock from a volcanic eruption is launched straight up into the air with no appreciable air resistance. which one of the following statements about this rock while it is in the air is correct a. the acceleration is downward at all points in motion b. the acceleration is downward at all points in motion except that is zero at the highest point c. on the way up, the acceleration is upward, and the velocity is always in the same direction as the acceleration

acceleration is downward at all points in motion

which of the following situations is impossible a. an object has velocity directed east and accleration directed west b. an object has velocity in the east and acceleration directed west c. an object has a constant non-zero velocity and changing acceleration d. an object has constant non-zero acceleration and changing velocity e. an object has zero velocity but non-zero acceleration

an object has constant non-zero acceleration and changing velocity

an auto manufacturers advertises that their car can go from 0-60 in 5seconds. this is a description of what characteristic of the car's motion a. average speed b. displacement c. instantaneous acceleration d. average acceleration e. instantaneous speed

average speed

two otters slide down a frictionless hillside of the same height but different slopes. the slope of the hill of otter 1 is 30 degrees, while the slope of the hill of otter 2 is 60 degrees. if both start from rest, which otter is moving faster when she reaches the bottom of her hill a. otter 1 is faster b. otter 2 is faster c. the heavier otter is faster d. the otter that took shorter time is faster e. both otters have the same speed

both have the same speed

the sum of 2 vectors of fixed magnitudes has the greatest magnitude when the angle between these 2 vectors is a. 90 degrees b. 270 degrees c. 0 degrees d. 60 degrees e. 180 degrees

c. 0 degrees

an object mobing in the +x direction experiences an acceleration of 4 m/s^2 this means the object is a. decreasing its velocity by 4m/s every second b. is traveling at 4 m/s c. travels 4 m every second d. is increasing its velocity by 4m/s every second

increasing its velocity by 4 m/s every second

a rock is thrown from the upper edge of a tall cliff at some angle above the horizontal. it reaches its highest point and starts falling down. which of the folllowing statements about hte rocks motion are true just before it hits the ground a. speed is the same as it was just as it was launched b. its horizontal velocity componenet is the same as it was just as it was launched c. its velocity is vertical d. its vertical velocity compoenent is the same as it was just as it was launched e. its horizontal component is 0

its horizontal velocity is the same as it was just as it was launched

james and john dive from an overhange into the lake below. james drops straight down from the edge. john takes a running start and jumps with an initial vertical velocity of 25m/s. compare the time it takes each to reach the water (no air resistance) a. james reaches the water first b. john reaches the water first c. can't known without knowing weights of each kids d. james and john will reach the water at the same time e. can't be determined without knowing the mass of both

james and john reach the water at the same time

a vector is a quantity that has what properties? a. magnitude only b. magnitude and direction c. direction only d. none

magnitude and direction

a very light ball moving east at a speed of 4m/s collides with a heavy stationary ball. the light ball bounces back to the west and the heavy ball moves very slowly to the east. which experiences the greater magnitude impulse during the collision a. neither, both experience the same impulse b. light ball c. heavy ball d. impossible to tell

neither, both experience the same magnitude of impulse

a crate is sliding down a inclined ramp at a constant speed of 0.55m/s. the vector sum of all the forces acting on the crate must point a. down the ramp b. perperdicular to the ramp c. up the ramp d. none of the above

none of the above

wind is blowin at 20m/s in an easterly direction. this is a statement about the winds... a. displacement b. position c. velocity d. acceleration e. speed

velocity

a baseball player runs from 3rd base and slides into home, coming to rest at home. where did most of the runners kinetic energy go when he slid into home plate? a. gravitational energy b. thermal energy c. chemical energy d. nowhere

thermal energy

when is average velocity of an object equal to the instantaneous velocity a. never b. only when the velocity is increasing at a constant rate c. when the velocity is constant d. only when the velocity is decreasing at a constant rate e. always

when the velocity is constant

when is total momentum not conserved? a. when there are only internal forces b. when there is a non-aero net external force c. when the net external forces is zero d. never

when there is non-zero external force