35.
Compare and contrast the advantages and disadvantages of renewable and nonrenewable energy sources.
1.
Calculate the IMA of a compound machine made of a pulley system with
supporting ropes and a wedge with length
cm and thickness
cm.
2.
Calculate the IMA of a compound machine made of a lever with an input arm of
cm and an output arm of
cm and an inclined plane with length
m and height
m.
3.
Which of the following is not one of the simple machines identified during the Renaissance?
inclined plane
screw
Rube Goldberg
wheel and axle
4.
A pirate captain forces a prisoner to walk the plank. As the prisoner is walking, they have
J of kinetic energy. The potential energy from being so high above the water is
times greater than the kinetic energy. What is the prisoner's mechanical energy?
J
J
J
J
5.
In what order of lever is the output force between the input force and fulcrum?
third order
first order
fourth order
second order
6.
Which formula represents the law of conservation of energy?
7.
What kind of screw will have the greatest IMA?
a screw with eight threads per centimeter
a screw with five threads per centimeter
a screw with six threads per centimeter
a screw with three threads per centimeter
8.
What is the IMA of a wedge that is
cm long and
cm thick?
9.
What is the most widely used renewable energy source in the United States?
solar
biomass
wind
hydroelectric
10.
Which of the following factors does not contribute to gravitational potential energy?
the shape of an object
the mass of an object
the strength of the gravitational field
the height of an object above the ground
11.
How does a car jack make it easier to lift up a car?
it increases the magnitude of the force
it increases the direction of the force
it decreases the mass of the car
it decreases the distance of the force
12.
Cellular respiration is a process that produces energy for the cell and is about 40% efficient. If 1200 joules of energy are used during cellular respiration, how much of this energy will be lost as heat?
1160 joules
480 joules
1170 joules
720 joules
13.
Which of the following is a benefit that nonrenewable energy sources have over renewable sources?
They replenish quickly.
They do not cause harm to animals.
They are more efficient.
They do not cause pollution.
14.
What is the mechanical advantage of the pulley system shown below?
An image of Block-and-tackle pulley – 4 rope, missing input and output force
4
3
5
2
15.
Calculate the power of a truck that does
of work in
seconds.
16.
A runner is looking to increases their stamina by training in areas where oxygen pressure is the lowest. Which of the following areas would be best for them to train in?
in a major city
near the ocean
at sea level
at the top of a mountain
17.
Archimedes' principle states that the buoyant force of an object is equal to which of the following?
the volume of the fluid displaced by the object
the mass of the fluid displaced by the object
the weight of the fluid displaced by the object
the viscosity of the fluid displaced by the object
18.
A marathon runner is running across a bridge. The runner has 10,000 J of kinetic energy, and 20,000 J of potential energy because they are on the bridge (above the ground). What is the runner's mechanical energy?
15,000 J
10,000 J
30,000 J
20,000 J
19.
If a student on Earth holds a
-kilogram rock
meters above the ground, what is the gravitational potential force of the rock?
J
J
J
J
20.
Calculate the power of a bicyclist who does
of work in
seconds.
21.
Calculate the actual mechanical advantage of a pulley system that requires an input force of
N but creates a tension, or output force, of
N.
22.
Classify a knife as one of the simple machines.
wedge
inclined plane
pulley
screw
23.
The energy that a compressed or stretched object contains is known as _____.
elastic potential energy
mechanical energy
kinetic energy
potential energy
24.
What is the IMA of an inclined plane with
meter ramp and a height of
meters?
25.
What is the process by which nuclear energy is created?
fracking
fission
carbonization
hydraulic fracturing
26.
Calculate the work done by a car that travels
meters through the exertion of
N of force.
joules
joules
joules
joules
27.
Which of the following is a renewable resource?
wind
natural gas
coal
crude oil
28.
Choose the item that is not a machine.
lawn mower
screwdriver
tire iron
fire
29.
According to scientists, humans have about how many years of oil remaining?
over a hundred years
between fifty to sixty
between five to ten
just a few years
30.
Calculate the power of a horse that produces
joules of work while running a race in
seconds.
watts
watts
watts
watts
31.
If a snowboarder going over a jump has
J of mechanical energy, and you know the snowboarder has
J of kinetic energy, how much potential energy does the snowboarder have?
J
J
J
J
32.
Calculate the work done by a weightlifter who applied
of force to lift a barbell
overhead.
J
J
J
J
33.
If you compress a spring with a spring constant of
N/m a distance of
meter, what is potential elastic energy of the spring?
J
J
.
J
J
34.
If a
cow stampedes at
, what is the cow's kinetic energy?
1 answer
1 answer