science test
A cart is loaded with bricks and pulled at a constant speed up an inclined plane to a vertical height of .45 meters. If the mass of the loaded cart is 3.0 kg, what is the potential energy of the loaded cart? (Number only, no units)
13.24
A little aluminum boat with a mass of 14.5 g has a volume of 450 cm3 . The boat is placed in a small pool of water and carefully filled with pennies. If each penny has a mass of 2.5 g, what is the minimum number of pennies needed to make the boat sink?
175 pennies
A bowling ball lifted off the floor to its shelf has 150 J of potential energy. If the shelf is 5.4 m above the floor, what is the mass of the bowling ball?
2.83 kg
A student has a rectangular block. It is 2 cm wide, 3 cm tall, and 25 cm long. It has a mass of 600 g. First, calculate the volume of the block, then, use that answer to determine the density of the block:
4 g/cm3
You have a lead ball with a mass of 420 g. The density of lead is 10.5 g/cm3. What is the volume of the ball? (Hint: Use the equation: volume = mass/density.)
40 cm3
Determine the kinetic energy of a football player with a mass 120 kg running down the field at 2.75 m/s:
453.75 J
What is the Kinetic energy of a boat that is traveling 2m/s and the boat has a mass of 26,000 kg?
52,000 J
Which has more energy?
A 25kg rock rolling at 12m/s?
Which has more energy?
A 5 kg rock on a 5 meter ledge
Which has more energy?
A 5kg rock on a 5 m ledge?
Nuclear energy is a example of:
the sun
Energy is the ability to do ____________ or cause a ________________.
work, change
chemical energy is a example of:
a battery
Which item below when moving at 2 m/s would have more kinetic energy?
a bowling ball
battery conversion is:
chemical to electric
candle conversion is:
chemical to heat
A laboratory instrument used to measure the mass of a solid:
digital balance
light bulb conversion is:
electric to light
loud speaker conversion is:
electric to sound
mechanical energy is a example of:
engine
thermal energy is a example of:
fire
A laboratory instrument used to measure the volume of a liquid is:
graduated cylinder
The base metric unit for mass is the:
gram
Volume is:
how much space is taken up by an object
The base metric unit for liquid volume is the:
liter
Density describes the relationship between the
mass and volume
rubbing your hands together conversion is:
mechanical to thermal
I want to determine the volume of a cereal box. Which of the following instruments should I use?
metric ruler
Chemical energy is a type of:
potential energy
Density if a characteristic property of a substance. This means that the density of water:
Stays the same regardless of the volume.
The Law of Conservation of Energy states:
Energy cannot be created or destroyed.
The energy in wind used to generate electricity is and example of:
Energy transformations
If a 50 kg object was sitting on a 20 meter cliff and was moved to a 30 meter cliff, it would have less potential energy.
False
Which has a greater effect on kinetic energy?
Increasing Velocity
What happens to kinetic energy as potential energy decreases?
It increases
Mechanical energy is a form of...
Kinetic energy
Gravitational potential energy depends on:
Mass and Height Above the Surface
James Prescott Joule is well known for a paddle-wheel experiment he conducted in the mid-1800s. He placed a paddle wheel in a bucket of water. Then he set up two weights on either side of the bucket. As the weights fell, they turned the paddle wheel. Joule recorded the temperature of the water before and after the paddle wheel began turning. He discovered that the water temperature increased as the paddle wheel turned. Based on this experiment, Joule concluded that the falling weights released mechanical energy, which was converted into heat by the turning wheel. He was convinced that whenever mechanical force is exerted, heat is produced. Which principle did Joule demonstrate with this experiment?
One form of energy can be converted into another form of energy.
Kinetic energy depends on:
Velocity and mass
James Prescott Joule is well known for a paddle-wheel experiment he conducted in the mid-1800s. He placed a paddle wheel in a bucket of water. Then he set up two weights on either side of the bucket. As the weights fell, they turned the paddle wheel. Joule recorded the temperature of the water before and after the paddle wheel began turning. He discovered that the water temperature increased as the paddle wheel turned. Based on this experiment, Joule concluded that the falling weights released mechanical energy, which was converted into heat by the turning wheel. He was convinced that whenever mechanical force is exerted, heat is produced.Based on Joule's finding that movement causes temperature changes in water, which one of the following would be a logical prediction?
Water at the base of a waterfall should be warmer than water at the top.
