Cubes
What happens to a particle that emits an alpha particle or a beta particle?
It becomes an atom of a different element
It is determined that a 500 mF capacitor loses half its remaining charge every second. If, after 5.0 s, its charge is q, what was its initial charge?
32q
Halley's Comet was last visible on Earth in 1986 and will be visible again in 2061. As it travels on its elliptical orbit around the sun, how does the speed of Halleyβs comet vary?
Increases as it nears the Sun.
The relativistic equations for time dilation, length contraction, momentum, and energy are accurate under what condition for speed?
The speed is lower than the speed of light
It is determined that a 500 mF capacitor loses half its remaining charge every second. If, after 5.0 s, its charge is q, what was its initial charge?
32q
If the sun collapsed suddenly to become a black hole, what would the Earth do immediately after?
Be pulled into the black hole and be pulled apart by tidal forces
A rope is used to connect two boxes, one with a mass of m and the other with a mass of 2m as shown in the diagram at the right. The boxes are resting on a smooth surface. A force F is then applied to the larger box. What is the tension in the connecting rope?
F/3
Absolute zero is best described as that temperature at which what happens for the molecules of a substance?
The molecules have minimum kinetic energy
An increase in the average speed of the molecules of a gas confined in a rigid cylinder will correspond to an increase in which of the following properties (could be multiple): temperature, pressure, volume
Pressure and temperature
An increase in the average speed of the molecules of a gas confined in a rigid cylinder will correspond to an increase in which of the following properties (could be multiple): temperature, pressure, volume
Pressure and temperature
A small sphere of mass m is attached to one end of a light string of length L with the other end of the string attached to a fixed point. The ball is moving at a constant speed v in a horizontal circle of radius r such that the string makes an angle theta with the vertical. Given that the tension in the string is T, what is the correct expression for the object's speed v?
sqrt(TLsin(theta)/m)
Why does the excess charge of a conductor in electrostatic equilibrium reside on the surface?
Since the electric field inside the conductor is zero in electrostatic equilibrium, the flux is zero, meaning the enclosed charge must be zero, so all the charge must be on the surface
A small sphere of mass m is attached to one end of a light string of length L with the other end of the string attached to a fixed point. The ball is moving at a constant speed v in a horizontal circle of radius r such that the string makes an angle theta with the vertical. Given that the tension in the string is T, what is the correct expression for the object's speed v
sqrt(TLsin(theta)/m)
Why is the outer surface of a conductor an equipotential surface?
The electric field on the outer surface is perpendicular to the surface, so the change in electric potential between any arbitrary pair of points is zero.
A 2-cm thick wall separates two rooms with temperatures of 20 oC and 10 oC respectively. The wall has a thermal conductivity of 0.1β π (π)(πΎ) and a surface area of 10 π2 . What is the rate of heat transfer through the wall?
500W
Two objects both move and uniformly accelerate to the right. At time t=0, the objects are at the same initial position, but Object 1 has an initial speed twice that of Object 2. Object 1 has one-half the acceleration of Object 2. After some time, T, the velocity of the two objects is the same. What is the ratio of the distance traveled in this time, T, by Object 2 to that traveled by Object 1?
4: 5
A place of zero displacement on a standing wave is called
A node
When two objects of very different masses collide, it is difficult to transfer a substantial fraction of the energy of one to the other. Consider two objects, of mass m and M β« m. 10. If the lighter object is initially at rest, and the heavier object collides elastically with it, what is the approximate maximum fraction of the heavier objectβs kinetic energy that could be transferred to the lighter object, in terms of m and M?
4m/M
The work of which of which pair of scientists is most closely associated with the discovery of the constancy of the speed of light?
Michelson and Morley
The work of which pair of scientists is most closely associated with the discovery of the constancy of the speed of light?
Michelson and Morley
When NASA began conducting test flights for the space shuttle, they used a βgliderβ that had a mass of 980 kg (including pilot). This glider was launched horizontally at 500 ππ βπ from a height of 3500 m. The glider eventually landed at a speed of 200 ππ βπ . What was the average force of air resistance exerted on the glider if it came in at a constant angle of 10ΒΊ to the Earth?
2090 N
A submarine emits a sonar signal to detect the distance to, and velocity of, a second nearby submarine. Which pair of wave behaviors is most closely associated with these two measurements?
Reflection and doppler effect
. The Moon orbits the Earth on a nearly circular orbit with a period, T, of 27.3 days. The radius of orbit is 3.84 x 105 km. What is the acceleration of the Moon toward the Earth?
2.72 x 10-3 π π 2
Which recent experiment in physics has provided further evidence supporting the existence of dark matter?
Observation of gravitational lensing effects around a distant galaxy cluster
What does a Venturi meter measure?
Fluid flow