Measurements / Units / Motion (1D & 2D)
A 0.25kg ball strikes a 1.25kg ball at rest. After the collision, the 0.25kg ball is moving with a velocity of 18ms and the second ball is moving with a velocity of 9ms. What is the initial velocity of the first ball?
1)103m/s
2)63m/s
3)44m/s
4)78m/s
2)63m/s
1. What happens according to Newton if you let an untied balloon go?
1) first law
2) second law
3) third law
3 rd Law
A 12kg ball moving at 37m/s strikes a second ball at rest. After the collision the 12kg ball is moving with a velocity of 19m/s and the second ball is moving with a velocity of 4m/s. What is the mass of the second ball?
1)54kg
2)92kg
3)49kg
4)35kg
1)54kg
A skier starts at the top of a hill with 350J of energy. Assuming energy is conserved, what is her final kinetic energy?
1)700J
2)175J
3)26.46J
4)350J
4)350J
What is the voltage of a circuit with 10A of current and 20Ω of resistance?
1)0.5V
2)200V
3)10V
4)2V
The value of Pi is known as 3.141592654. express the value of Pi using 5 significant figures.
3.1416
What is another name for the first law of motion? Why is it given that name?
Law of inertia.
Hockey puck A (2kg) travels with a velocity of 40ms to the right when it collides with hockey puck B (1.6kg), which was originally at rest. After the collision, puck A is stationary. Assume no external forces are in play and that the momentum of the pucks are conserved. What is the final velocity of puck B after the collision?
1)45m/s
2)50m/s
3)50m/s
4)48m/s
3)50m/s
A skier starts at the top of a hill with 100J of potential energy. At the bottom of the hill, she has only 75J of kinetic energy. Assuming that at the top of the hill she has only potential energy and at the bottom she has only kinetic energy, what can we conclude?
1)The skier is at the bottom of one hill but will go back up another
2)Work must have been done
3)The skier miscalculated her energies
2)Work must have been done
What is the current of a circuit with a voltage of 12V and a total resistance of 5Ω?
1)60A
2)0.42A
3)7A
4)2.4A
4)2.4A
Using the correct number of Sig Figs, solve this operation with Scientific Notation.
(8.44x103cm)+(2.5x103cm)
1.1x104cm
Sand is often placed on an icy road because the sand
decreases the coefficant of friction between the tires of a car and the road.
A bullet with mass 0.25g hits a ballistic pendulum with length 1m and mass 100g and lodges in it. When the bullet hits the pendulum it swings up from the equilibrium position and reaches an angle 30∘ at its maximum. Determine the bullet’s velocity.
1)115m/s
2)425m/s
3)800m/s
4)650m/s
4)650m/s
A rock is dropped in freefall from some initial height h. Which of the following describes its final velocity right before it hits the ground?
1)√∗gh2
2)gh√2
3)√2gh
4)g2h
3)√2gh
What is the resistance in a circuit with a voltage of 50V and a current of 8A?
1)0.16Ω
2)6.25Ω
3)42Ω
4)58Ω
2)6.35
A 10kg ball moving at 13ms strikes a 20kg ball at rest. After the collision the 10kg ball is moving with a velocity of 7ms. What is the velocity of the second ball?
1)8m/s
2)3m/s
3)4m/s
4)12m/s
2)3m/s
Which of these is NOT an example of inertia?
1)A construction worker pushes a metal box and notices it is harder make the box start moving than it is to push it at a constant velocity
2)The force a hammer exerts on a nail is the same as the force the nail exerts on the hammer
3)A child riding a merry-go-round lets go and is thrown off the ride
2)The force a hammer exerts on a nail is the same as the force the nail exerts on the hammer
A man with a mass of m is painting a house. He stands on a tall ladder of height h. He leans over and falls straight down off the ladder. If he is in the air for s seconds, what will be his momentum right before he hits the ground?
1)mgh
2)(mg)(s)
3)(mv)(s)
4)12mv2
2)(mg)(s)
A 3.23kg book falls off the top of a 3.01m bookshelf. What is its kinetic energy right before it hits the ground?
g=−9.8m/s2
1)16.04J
2)31.76J
3)123.38J
4)95.28J
4)95.28J
A 9V battery is connected to a circuit. The measured current is 2A. What is the equivalent resistance?
1)18Ω
2)4.5Ω
3)9Ω
4)10Ω
2)4.5Ω
A 2200kg car travelling at 30m/s collides with another 2200kg car that is at rest. The two bumpers lock and the cars move forward together. What is their final velocity?
1)0m/s
2)1.5m/s
3)15m/s
4)30m/s
3)15m/s
While pushing a very heavy box, Derek notices that it was much harder for him to get the box to start moving than it was for him to get the box to continue to move once it had started. This is an example of which mechanics principle?
1)Newton's third law
2)Newton's second law
3)Law of frictional force
4)Newton's first law
4)Newton's first law
A 6kg ball is thrown west at 20ms and collides with a 14kg ball while in the air. If the balls stick together in the crash and fall straight down to the ground, what was the velocity of the second ball?
1)11.2m/s downward
2)8.6m/s east
3)2.3m/s east
4)4.7m/s east
2)8.6m/s east
A man stands on a tall ladder of height h. He leans over a little too far and falls off the ladder. If his mass is m, what is his kinetic energy right before he hits the ground?
1)mgh
2)12mg2
3)√2g
4)2ghm
1)mgh
A closed electric circuit is set up so that there is a current of 9.9A and a voltage of 30.22V. What is the resistance in the circuit?
1)3.05Ω
2)20.32Ω
3)6.1Ω
4)299.18Ω
1)3.05Ω