3RD QRTR Flashcards
(43 cards)
What is the ability to do work?
a) Force
b) Energy
c) Power
d) Momentum
B
Which type of energy is stored due to position?
a) Kinetic Energy
b) Potential Energy
c) Thermal Energy
d) Chemical Energy
B
What is the formula for Kinetic Energy?
a) KE = mg
b) KE = ½ mv²
c) KE = mgh
d) KE = Fd
B
Power is the rate at which work is done. What is its SI unit?
a) Joule
b) Watt
c) Newton
d) Pascal
B
A 10 kg object is lifted to a height of 5 meters. How much gravitational potential energy does it have? (g = 9.8 m/s²)
PE = mgh = (10 kg)(9.8 m/s²)(5 m) = 490 J
A 1,000 W motor does work for 10 seconds. How much work is done?
W = Pt = (1000 W)(10 s) = 10,000 J
Which of the following is considered a fluid?
a) Solid
b) Gas
c) Both liquid and gas
d) Plasma
C
What principle states that an object submerged in a fluid experiences an upward force equal to the weight of the displaced fluid?
a) Pascal’s Principle
b) Bernoulli’s Principle
c) Archimedes’ Principle
d) Boyle’s Law
C
What happens to pressure as depth increases in a fluid?
a) It increases
b) It decreases
c) It remains constant
d) It fluctuates
A
A cube with a volume of 0.05 m³ is submerged in water (density = 1000 kg/m³). What is the buoyant force acting on it? (g = 9.8 m/s²)
Fb = ρfluid × Vdisplaced × g = (1000 kg/m³)(0.05 m³)(9.8 m/s²) = 490 N
What is the unit of heat energy?
a) Watt
b) Joule
c) Pascal
d) Newton
B
Heat always transfers from:
a) Cold to hot
b) Hot to cold
c) Objects with the same temperature
d) Objects with higher density
B
What type of heat transfer occurs through direct contact?
a) Conduction
b) Convection
c) Radiation
d) Expansion
A
The amount of heat required to raise the temperature of 1 kg of a substance by 1°C is called:
a) Specific Heat
b) Latent Heat
c) Kinetic Energy
d) Potential Energy
A
How much heat energy is required to raise the temperature of 2 kg of water from 20°C to 80°C? (Specific heat of water = 4186 J/kg°C)
Q = mcΔT = (2 kg)(4186 J/kg°C)(80°C - 20°C) = 502,320 J
Convert 100°C to Kelvin.
K = °C + 273 = 100 + 273 = 373 K
Which law states that energy cannot be created or destroyed, only transferred or transformed?
a) Zeroth Law
b) First Law
c) Second Law
d) Third Law
B
The Second Law of Thermodynamics states that:
a) Energy is conserved
b) Heat flows naturally from hot to cold
c) All motion stops at absolute zero
d) Work is required to move heat from cold to hot
B
Absolute zero (0K) is the temperature at which:
a) All molecular motion stops
b) Water boils
c) Objects reach thermal equilibrium
d) Matter ceases to exist
A
What is a wave?
a) A transfer of matter
b) A disturbance that carries energy through space or matter
c) A force that moves objects
d) A medium for heat transfer
B
If two systems are in thermal equilibrium with a third system, they are also in thermal equilibrium with each other. This is the:
a) First Law of Thermodynamics
b) Second Law of Thermodynamics
c) Third Law of Thermodynamics
d) Zeroth Law of Thermodynamics
D
What type of wave requires a medium to travel?
a) Electromagnetic wave
b) Mechanical wave
c) Gravitational wave
d) Sound wave
B
Which of the following is an example of an electromagnetic wave?
a) Sound wave
b) Ocean wave
c) Radio wave
d) Seismic wave
C
What is the main difference between transverse and longitudinal waves?
a) The speed at which they travel
b) The direction of particle movement relative to wave propagation
c) The requirement of a medium
d) Their ability to carry energy
B
