Unit 1 - Waves
TRUE or FALSE: Waves transfer mass and energy
False, waves ONLY transfer energy
A series circuit has 3 different resistors. Each resistor has a resistance of 20 ohms. What is the total resistance in the circuit?
R = 60 Ohms
A bowling ball, a feather, a , and a large truck ball are all released from the same height simultaneously. Ignoring air resistance, which object will hit the ground first?
They all land at the same time.
TRUE or FALSE: A firetruck is traveling towards you. According to the Doppler Effect, the frequency of the siren will appear to shift up.
TRUE.
Two waves with possitive amplitudes will undergo this type of interference (wave superposition):
Constructive interference.
A parallel circuit has 3 different resistors. Each resistor has a resistance of 30 ohms. What is the total resistance in the circuit?
R = 10 Ohms
An object is traveling at a constant positive acceleration. Draw a perfect velocity vs. time graph for this object.
V vs t with positive linear slope
An object is traveling at a constant negative velocity. Draw a perfect position vs. time graph for this object.
x v. t graph with a negative linear slope
A wave has a frequency of 2 Hz and a wavelegth of 4m. What is the wave's velocity?
A toaster has a heating resistance of 50 Ω and is connected to a 12 V outlet. What is the current flowing through the toaster?
I = 0.24 A
Draw a motion dot diagram for an object that is accelerating for 7 seconds and then suddenly breaks to a stop for 5 seconds.
Shows acceleration then deceleration and has 12 dots.
A serious circuit has a total resistance of 20 Ohms and a current of 0.4 A. What is the voltage drawn from the battery?
V = 8V
Cora measures the wavelength of a wave as 24 m, and the period of the wave is 2s. What is the speed of the wave?
v = 12 m/s
If the distance between two charged particles is 4 times larger, how will that change the electrostatic force?
A car starts from rest and accelerates at 5 m/s2 over a time of 30 seconds. Determine the displacement of the car.
Δx = 2250m
If the distance between two charged particles is 2 times smaller, how will that change the electrostatic force?
The force will be 4 times larger.
Waves made by a machine in a swimming pool. In 2 seconds 10 complete waves go past a person standing in the pool. Determine the time period and frequency of water waves and give the units.
f = 5 Hz and T = 0.2 s
A 4C charge is 0.5 m away from a -10C charge. What is the force between these two particles?
F = - 1.44 *1012 N
A student drops a ball from the top of a set of 5m tall bleachers. How long will it take the ball to fall?
t = 1.01s
In the year 2048, Valor College Prep sends Physics students on a field lesson on an asteroid. They want to measure the acceleration of an object in free fall. They climb to the top of a 80m tall tower and drop their object. They measure the time it takes the object to fall to be 18s. What is the acceleration due to gravity on this asteroid? REMEMBER: the acceleration due to gravity is -9.8m/s2 on Earth.
a = 0.49 m/s2