PHYSICS EXAMS QUESTIONS AND VERIFIED ANSWERS, 100%
GUARANTEE
You and your friend, who weighs the same as you, want to go to the top of the Eiffel Tower.
Your friend takes the elevator straight up. You decide to walk up the spiral stairway, taking
longer to do so. Compare the gravitational potential energy of you and your friend, after you both
reach the top. - Both of you have the same amount of gravitational potential energy at the
top.
A stone can slide down one of four different frictionless ramps, as shown in the figure. For
which ramp will the speed of the ball be the greatest at the bottom? - The speed of the ball
will be the same for all ramps.
The area under the curve, on a Force-position (F-x) graph, represents - work
Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. If
there is no air resistance, when they hit the ground - the heavier one will have twice the
kinetic energy of the lighter one.
If both the mass and the velocity of a ball are tripled, the kinetic energy is increased by a factor
of - 27
A spring is characterized by a spring constant of 60. N/m. How much potential energy does it
store when stretched by 1.0 cm? - 0.003 J
work - the product of the magnitude of the displacement times the component of the force
parallel to the displacement (W=Fd, Fdcostheta)
kinetic energy - energy of motion
,potential energy - energy of position; associated with forces that depend on the
position/configuration of an object(s) relative to the surroundings
gravitational potential energy - the product of the object's weight (mg) and its height (y)
above some reference level; potential energy equal to work done by lifting an object
conservative forces - forces for which the work done does not depend on the path taken
but only on the initial and final positions
non-conservative forces - forces for which the work done depends on the path
elastic potential energy - potential energy stored as a result of the deformation of an
elastic object (stretching of a spring); PEsubel=1/2kx^2
total mechanical energy - E=the sum of the kinetic (KE) and potential (PE) energies at any
moment
horsepower - 1 hp=550 ft*lb/s=746 W
power - the rate at which work is done; time rate of change when doing work
watt - SI unit for power; 1 W=1 J/s (joules per second)
efficiency - ratio of the useful power output of the engine (Psubout) to the power input
(Psubin); amount of useful work by a system compared with the energy input
joule - SI unit for work; 1 J=1 N*m (newton-meters)
, A 10. kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. The spring constant is -
49 N/cm
What distinguishes work done by conservative versus non-conservative forces? - Non-
conservative depend on the path taken
Conservative is only concerned with initial and final positions
A driver, traveling at 22. m/s, slows down her 1500. kg car to stop for a red light. What work is
done by the friction force against the wheels? - 3.6 E5 J
In the SI system of measurements, the base unit for length is - meter
If a person weighs 170 lb, what is their mass in micrograms? - 7.71 E10
If the dimensions of a square are 1.23 ft x 14.6 in, find the area in cm^2. 1 in=2.54 cm -
1.39 E3 cm^2
A car is traveling at 4.53 m/s, calculate its speed in km/h. - 16.3 km/h
Speed is to velocity as distance is to - displacement
What is the mass of a woman who weighs 1.1 E2 lbs? - 50 kg
How many m^2 is equal to 1.0 cm^2? - 10 E-4
When a ball is thrown straight up, which of the following is zero at its highest point? -
velocity
GUARANTEE
You and your friend, who weighs the same as you, want to go to the top of the Eiffel Tower.
Your friend takes the elevator straight up. You decide to walk up the spiral stairway, taking
longer to do so. Compare the gravitational potential energy of you and your friend, after you both
reach the top. - Both of you have the same amount of gravitational potential energy at the
top.
A stone can slide down one of four different frictionless ramps, as shown in the figure. For
which ramp will the speed of the ball be the greatest at the bottom? - The speed of the ball
will be the same for all ramps.
The area under the curve, on a Force-position (F-x) graph, represents - work
Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. If
there is no air resistance, when they hit the ground - the heavier one will have twice the
kinetic energy of the lighter one.
If both the mass and the velocity of a ball are tripled, the kinetic energy is increased by a factor
of - 27
A spring is characterized by a spring constant of 60. N/m. How much potential energy does it
store when stretched by 1.0 cm? - 0.003 J
work - the product of the magnitude of the displacement times the component of the force
parallel to the displacement (W=Fd, Fdcostheta)
kinetic energy - energy of motion
,potential energy - energy of position; associated with forces that depend on the
position/configuration of an object(s) relative to the surroundings
gravitational potential energy - the product of the object's weight (mg) and its height (y)
above some reference level; potential energy equal to work done by lifting an object
conservative forces - forces for which the work done does not depend on the path taken
but only on the initial and final positions
non-conservative forces - forces for which the work done depends on the path
elastic potential energy - potential energy stored as a result of the deformation of an
elastic object (stretching of a spring); PEsubel=1/2kx^2
total mechanical energy - E=the sum of the kinetic (KE) and potential (PE) energies at any
moment
horsepower - 1 hp=550 ft*lb/s=746 W
power - the rate at which work is done; time rate of change when doing work
watt - SI unit for power; 1 W=1 J/s (joules per second)
efficiency - ratio of the useful power output of the engine (Psubout) to the power input
(Psubin); amount of useful work by a system compared with the energy input
joule - SI unit for work; 1 J=1 N*m (newton-meters)
, A 10. kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. The spring constant is -
49 N/cm
What distinguishes work done by conservative versus non-conservative forces? - Non-
conservative depend on the path taken
Conservative is only concerned with initial and final positions
A driver, traveling at 22. m/s, slows down her 1500. kg car to stop for a red light. What work is
done by the friction force against the wheels? - 3.6 E5 J
In the SI system of measurements, the base unit for length is - meter
If a person weighs 170 lb, what is their mass in micrograms? - 7.71 E10
If the dimensions of a square are 1.23 ft x 14.6 in, find the area in cm^2. 1 in=2.54 cm -
1.39 E3 cm^2
A car is traveling at 4.53 m/s, calculate its speed in km/h. - 16.3 km/h
Speed is to velocity as distance is to - displacement
What is the mass of a woman who weighs 1.1 E2 lbs? - 50 kg
How many m^2 is equal to 1.0 cm^2? - 10 E-4
When a ball is thrown straight up, which of the following is zero at its highest point? -
velocity
