Waves
An acoustic organ is a musical instrument with pipes. The oscillation of air molecules in the pipes of the organ produces sound waves that are:
(1) electromagnetic and longitudinal
(2) electromagnetic and transverse
(3) mechanical and longitudinal
(4) mechanical and transverse
(3) mechanical and longitudinal
In a series circuit with three light bulbs and a battery, the potential diffference across the battery is 12 V and the current is 5 A. What is the current across bulb #2?
5 A
In an attempt to get ketchup out of a bottle, a student takes off the cap, turns the bottle upside down, accelerates it downward, and then suddenly stops it. Ketchup is released from the open bottle because the ketchup doesn’t stop moving when the bottle does. The ketchup leaving the bottle illustrates which law?
Newton's First Law of Inertia
A photon with an energy of 1.33×10−21 joules has a frequency of
2.2.01x10-34 Hz
Determine the displacement of a bike rider that travels 5 miles north and then 3 miles east.
5.83 miles
What is the wavelength of a 300.-hertz sound wave in air at STP?
1.10 m
What is the resistance of a 100.-watt bulb when operating a potential difference of 120. volts?
144 ohms
The total mass of the skydiver with his parachute is 85.0 kilograms. If the magnitude of the force of air resistance is 652 newtons, the acceleration of the skydiver is:
2.14 m/s2 down
Which statement describes the gravitational potential energy (PE), kinetic energy (KE), and internal (thermal) energy (Q), of a wooden crate as it is pushed across a level classroom floor at constant speed?
(1) The PE decreases, KE remains the same, and Q decreases.
(2) The PE increases, KE increases, and Q decreases.
(3) The PE remains the same, KE decreases, and Q increases.
(4) The PE remains the same, KE remains the same, and Q increases.
(4) The PE remains the same, KE remains the same, and Q increases.
Which quantity represents the slope of a velocity vs time graph?
acceleration
Compared to waves of blue light traveling in a vacuum, waves of red light traveling in a vacuum have:
(1) a lower frequency and a lower speed
(2) a lower frequency and the same speed
(3) the same frequency and a lower speed
(4) the same frequency and the same speed
a lower frequency and the same speed
A copper wire carries 2.8 amperes of current. The total amount of charge that passes a point in the wire in 1.3 milliseconds is
3.64x10-3 C
A projectile is launched from level ground with an initial vertical speed of 26 meters per second upward and an initial horizontal speed of 15 meters per second.
Calculate the total time the projectile is in the air before the projectile returns to the level ground.
5.3 s
One example of a force doing work is the force exerted by:
(1) Earth on a high diver falling toward a pool from a platform above
(2) a hook on an engine held stationary above a car
(3) a frictionless horizontal air hockey table on a puck moving across the table at a constant velocity
(4) a weightlifter on a barbell he holds motionless over his head
(1) Earth on a high diver falling toward a pool from a platform above
A 15.0-gram air hockey puck sliding on a horizontal surface at a velocity of 7.00 meters per second north collides with a 15.0-gram air hockey puck traveling at a velocity of 9.00 meters per second south. The momentum of the system of pucks after the collision is
-.030 kg*m/s
Which list identifi es portions of the electromagnetic spectrum in order of increasing frequency?
(1) gamma ray, infrared, visible, ultraviolet
(2) ultraviolet, visible, infrared, gamma ray
(3) infrared, visible, ultraviolet, gamma ray
(4) gamma ray, ultraviolet, visible, infrared
(3) infrared, visible, ultraviolet, gamma ray
The direction of the electric field at a point in space is defined as the direction of the force exerted by the field on a ___________.
A positive test charge
The same net force is applied to object A and object B. The mass of B is three times greater than the mass of A. Compared to the acceleration of A, the acceleration of B is
Smaller (1/3 as great)
A battery-powered electric motor is used to cause the wheels of a toy car to rotate. In this motor, there is a conversion of what types of energy?
chemical -> electrical -> mechanical (kinetic)
What is the mass equivalent of 3.37×10−19 joule?
3.74x10-36 kg
An amplifi ed sound wave produced by an opera singer shatters a glass. Which phenomenon best explains this event?
(1) diffraction
(2) reflection
(3) refraction
(4) resonance
(4) resonance
Calculate the equivalent resistance of the circuit on the white board.
30.77 ohms
A race car travels around a flat circular track at constant speed. The net force on the car acts in what direction?
Ttowards the center of the circular path
An 2 kg apple falls from a 15 meter high branch. What is the speed of teh apple right before it hits the ground?
17.15 m/s
During the radioactive decay of a uranium-238 atom, a thorium-234 atom and an alpha particle are produced. During this process, there is conservation of:
(1) charge, only
(2) mass-energy, only
(3) both charge and mass-energy
(4) neither charge nor mass-energy
both charge and mass-energy