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100
E = ? h = 10m g = 9.8m/s2 m=3kg
E = 294 J
100
E=? m=2kg v=3m/s
E = 9J
100
The equation for potential energy is
Ep=mgh
100
Energy is related to power by the formula....
E=Pt
100
The units for energy are (with symbol)
Joules (J)
200
Energy cannot be...
created or destroyed
200
E = 4.68J m=6.5kg v?
v = 1.2m/s
200
The amount of energy required to raise the temperature of 1kg of a substance by 1 degree C is called?
specific heat capacity
200
The units for specific heat capacity are:
J/kg/C
200
The formula for Kinetic energy is:
E=1/2mv^2
300
E=100J m=9kg v=?
v = 4.71m/s
300
1kg of water is raised in temperature by 2C. How much energy is required? c= 4180J/kg/C
E = 8360J
300
A 0.4kg ball is dropped from a height of 6m. How much potential energy did the ball have?
E = 23.52J
300
What height was a 2.5kg brick dropped from if it had a potential energy of 300J?
h = 12.24m
300
What is the mass of an object with a velocity of 0.4m/s if it has a total of 663J
m=7.5kg
400
Heat energy is...
the kinetic energy of particles
400
Describe how the energy of a bouncy ball changes over time starting from when it is dropped.
The bouncy ball has potential energy. As it is dropped it loses potential energy and gains kinetic energy. When it hits the ground it has a maximum kinetic energy. As it bounces up it loses potential energy and gains potential energy
400
What is the power output of a turbine if it converts 150J of kinetic energy to electrical energy in 10s?
P=15W
400
What is the temperature increase of 0.5kg of water if 5000J of heat energy is given? c=4180J/kg/C
T=2.4C
400
What is the mass of water if 2500J of heat energy raises the temperature by 7C? c=4180J/kg/C
m=0.08gkg
500
Calculate the mass of required to have a velocity of 6m/s if 131.5J of potential energy is converted into kinetic energy
m=0.91kg
500
What is the formula for specific heat capacity?
Eh=cmT
500
How long is the 3000W kettle boiling for if 17000J of electrical energy is used?
5.7s
500
What is the specific heat capacity of lead if 1950J can raise the temperature of 1kg by 15C?
c=130J/kg/C
500
Which substance has the highest specific heat capacity if 1000J can raise the temperature of 1kg by: Granite: 1.25C Copper: 2.5C
Granite