Show:
Density/ Buoyancy
Misc. 1
Heat Energy
Potential and Kinetic Energy
Misc. 2
100
If I have a piece of rubber that has a density of 1.2g/mL will it sink or float in water? Why?
It will sink because the density of water is less than the density of the water.
100
what is the volume of a cube that has has a height of 3cm, a width of 4cm, and a depth of 10cm?
120 cubic centimeters
100
What direction does energy always move.
Energy always moves from a hotter place to a colder place.
100
Explain the difference between potential and kinetic energy.
Potential energy is stored energy waiting to do work. While kinetic energy is the energy of actual work , motion or change.
100
Energy is the ability to __________________________
do work or create change.
200
If there is a buoyant force of 10.5 Newtons and a gravitational force of 5 Newtons acting on an object will that object sink or float? Why?
It will float because the force pushing up is greater than the force pushing down.
200
If I have a piece of cork and I break a piece off, will the density change? Why?
No. I have changed the mass and volume but the density will work out to the same. If I change the density then I change the substance.
200
What type or types of energy can move by direct contact of particles.
Conduction.
200
If I drop a ball from a height of 2 meters, at what point does it have the most Potential Energy?
At 2 Meters while still in my hand.
200
Heat rises because_________________________.
Heat rises because it is less dense than cooler fluids.
300
What are the two forces involved in the buoyancy of an object? What direct do they push?
Gravity pushed down. Buoyancy pushes up.
300
Which has higher energy? Cold air or warm air?
Warm air has more energy
300
What type or types of energy can move through a vacuum?
Radiation
300
At what point on a roller coaster hill does the car have the most potential energy?
At the bottom of the hill just before the track levels out.
300
If I drop a a bowling ball from a height of 1 meter, at what point will it have the same amount of kinetic and potential energy?
At 0.5 meters.
400
Cargo ships are made of steel which has a density of 8.08g/mL. Why are they able to float on water?
They are so huge that there is more buoyant force than gravity acting on them. This helps them float. Their average density is also less than that of water because of all the air inside.
400
What is the volume of a piece of lead that has a density 14.4g/mL and displace 10mL of water?
10 mL
400
What type or types of energy travels with the movement of particles.
Convection.
400
There is a bell at the top of a tower that is 45 m high. The bell weighs 190 N. The bell has ____________ energy. Calculate it.
Potential Energy. 8,550 Joules
400
What phases of matter can each type of heat transfer occur in ?
Convection = gas and liquid Conduction = must involve a solid (but can involve fluids as well. Radiation = all phase but doesn't need matter at all.
500
If you have a piece of gold with a density of 19.3 g/mL and a volume of 13mL what is its mass?
M = D x V M = 19.3g/mL x 9mL M = 173.7 g
500
Explain how a silver, metal thermos with a vacuum is able to keep your water cold on a hot summer day. You must talk about all three types of heat transfer.
Silver color reflects radiation away from the contents of the thermos. Conduction and Convection cannot pass through the vacuum as they need matter to work.
500
What type(s) of energy are involved in roasting and eating a marshmallow. Explain the movement of the heat.
Radiation from the fire creates convection currents which help to toast your marshmallow. Conduction occurs when you put the hot marshmallow in your mouth to eat it. The heat moves from the fire to the air and marshmallow and then to your mouth
500
Calculate the kinetic energy of a 22,000 kilogram train moving at a velocity of 50 meters per second.
27,500,000 Joules
500
DAILY DOUBLE!!!
The fur is clear letting radiation from the sun pass through to warm the dark colored skin of the bear. The fur than acts as insulation to keep the heat from escaping back into the air.