Energy
Q: The energy an object has due to its motion.
A: What is kinetic energy?
Q: This is the wavelength of a wave traveling at 300 m/s with a frequency of 60 Hz.
λ = v/f
A: What is 5 meters? (λ = v/f = 300/60)
Q: This is the type of electromagnetic wave with the shortest wavelength.
A: What is gamma radiation?
Q: This device converts mechanical energy into electrical energy.
A: What is a generator?
Q: An object with 30 J of potential energy is dropped. Neglecting air resistance, how much kinetic energy will it have just before hitting the ground?
A: What is 30 joules? (Energy conservation: PE becomes KE)
Q: The period of a wave with frequency 50 Hz.
T=1/f
A: What is 0.02 seconds? (T = 1/f = 1/50)
Q: This portion of the EM spectrum is visible to the human eye.
A: What is visible light?
Q: This device converts electrical energy into mechanical energy.
A: What is an electric motor?
Q: A 5 kg object is raised to a height of 10 m. What is its gravitational potential energy? (g = 9.8 m/s²)
A: What is 490 joules? (PE = mgh = 5 × 9.8 × 10)
Q: If the wavelength of a wave is halved but the speed stays the same, what happens to its frequency?
A: What is it doubles? (f = v/λ, so if λ ↓, f ↑)
Q: This part of the EM spectrum is responsible for sunburns.
A: What is ultraviolet (UV) radiation?
DAILY DOUBLE!!
Determine the distance between two charged particles: 25 C and 16 C, when the electrostatic force between them is 1.5 x 106 N.
Q: What is the kinetic energy of a 2 kg object moving at 3 m/s?
A: What is 9 joules? (KE = ½mv² = 0.5 × 2 × 9)
Q: A wave has a speed of 250 m/s and a period of 0.01 s. What is its wavelength?
What is 2.5 meters? (λ = v × T = 250 × 0.01)
Q: This type of wave is used in night vision and thermal cameras.
A: What is infrared radiation?
Q: Two opposite charges will exert this type of force on each other.
A: What is an attractive force?
How much energy does a 10 kg object have traveling at 3 m/s that is 12 m above ground?
What is 1,221 J?
Q: A wave that vibrates perpendicular to its direction of motion.
What is a transverse wave?
Q: This type of radiation is used in airport scanners and in medicine to image bones.
A: What are X-rays?
Q: If the distance between two charges is tripled, the force becomes this fraction of the original.
A: What is 1/9? (Inverse square law: F∝1/r2)