The correct answer is (C). The collision described in the problem is perfectly elastic because the golf ball had the same velocity when it rebounded from the wall as when it struck the wall. Momentum is conserved perfectly, so the golf ball must have the same momentum after the collision with the wall as it had when it approached the wall before the collision.

The transfer of heat due to a moving fluid (such as air) is known as convection. (D and E, by the way, are not modes of heat transfer and can therefore be eliminated immediately.)

Since the image is projected onto a screen, it must be real, and therefore inverted. The magnification must be negative, so

The correct answer is (B). The velocity of a wave is v = λ·f. Substitute into the equation and solve. v = λf = (0.5 m)(6.0 Hz) = 3.0 m/s

The correct answer is (B). When water freezes, it becomes less dense. Therefore, when ice cubes are placed into liquid water, they displace a volume of water equal to their weight. When the ice melts no further, volume is added to the container.

The correct answer is (C). The skydiver accelerates after he jumps until the friction from the air is equal to his downward force, which is his weight.

Since the centripetal force always points along a radius toward the center of the circle, and the velocity of the object is always tangent to the circle (and thus perpendicular to the radius), the work done by the centripetal force is zero. Alternatively, since the object's speed remains constant, the work-energy theorem tells us that no work is being performed.

The correct answer is (E). The hydrogen must gain 12.75eV of energy to be raised to the n = 5 level, where its potential is .85eV.

The correct answer is (C). The starting velocity of the two rocks is not the same, but once in free fall the acceleration of the two rocks is equal.

The correct answer is (B). The transformer equation is

The correct answer is (C). This is an example of the first condition of equilibrium.

The correct answer is (C). The charge on a solid conducting body is found on the outside of the object. The charges distribute themselves equally around the outside of the conducting body because of the mutual repulsion the excess charges have for themselves.

Relative to the central maximum, the locations of the bright fringes on the screen are given by the expression mL(λ/d), where λ is the wavelength of the light used, L is the distance to the screen, d is the separation of the slits, and m is an integer. The width of a fringe is, therefore (m + 1)L(λ/d) - mL(λ/d) = λL/d. One way to increase λL/d is to decrease d.

The correct answer is (B). Stars are a source of light waves. As such, the waves approach the earth as fronts. When a star is approaching the earth the wave fronts reach us at an increasing rate. When a star is receding from us, the wave fronts reach us at a lower rate. In both cases a frequency change (Doppler shift) can be detected.

Since the force F is perpendicular to the displacement, the work it does is zero.

The correct answer is (C). The specific heat capacity of a substance is defined as the amount of heat required to raise l g of the substance by 1 degrees celsius. If substance A has a specific heat capacity that is twice the specific heat capacity of substance B, that means twice as much heat is required to raise the temperature of substance A as is required for substance B. The converse is also true ”the heat required to raise the temperature of substance A by 1 degrees celsius will raise the temperature of substance B by 2 degrees celsius.

The correct answer is (C). All the gravitational potential energy at the top of the child's swing pathway is converted into kinetic energy at the bottom of her swing pathway.

The correct answer is (C). Regardless of where on the merrygo- round you are located during the ride, your angular displacement is the same for the whole ride.

Only a transverse wave, defined to be a wave in which the oscillation is perpendicular to the direction of wave propagation, can be polarized. Since sound waves are longitudinal, they cannot be polarized.

The correct answer is (E). Gamma radiation has no mass. It is emitted from an unstable nucleus, which changes to a lower energy state. There is no mass change involved, so the nucleus remains essentially the same minus the emitted energy.

The correct answer is (B). The tension in a rope is the same throughout. Both teams must pull with a force of 1200N to maintain static equilibrium, so the total tension is 2400N.

The correct answer is (C). The value of the electric field about a point source is E =kq/r2 . The distance from the point in question determines the strength of the electric field in this case.

The correct answer is (C). The contact between the golf club and the ball constitutes an equal and opposite force pair.

The correct answer is (B). Use F=ma to solve the problem. Don't forget to subtract the frictional force from the applied force. Also don't forget to convert the weight of the object into mass. Set the problem up in this manner:

The correct answer is (E). All the answers are stated opposite from their correct relativistic statement except for choice (E).

Electrostatic force obeys an inverse-square law: FE ∝ . Therefore, if r increases by a factor of 3, then FE decreases by a factor of 32 = 9.

The correct answer is (A). The first law of thermodynamics makes it clear that a hot object loses heat to a cold object. If no heat is added or subtracted from a system, the heat in the system remains constant in the system.

The correct answer is (E). The charge on the two does not change, so the force between them MUST operate in the same direction. The magnitude of the force increases by 4.

The correct answer is (D). The particle is completely unaffected by the field, which eliminates the charge-carrying particles. Thus the electron, the positron (a positive electron), and the proton are not the correct choice. The gamma ray is also unaffected by a magnetic field, but it is not a particle and would not be seen, so it, too, is eliminated from consideration. The only particle that is unaffected by the magnetic field is the neutron.

Since the coefficient of thermal expansion has units of deg−1 whether it's for linear, area, or volume expansion, we can eliminate C, D, and E, because the units of delta V would be wrong if any of these equations were true. Now, all you need to remember is that the coefficient of volume expansion is different from the coefficient of linear expansion to eliminate A and choose B. [In case you want to see how B is derived, notice that since each linear dimension, L, of a solid increases by delta LL(delta)T, the new volume of a heated solid, V ², is V(1 + delta L(delta)T)3 = V(1 + 3delta L(delta)T + 3delta L2(delta)T + delta L3(delta)T). Since delta L is so small, the terms involving delta L2 and delta L3 are really small and can be i

The correct answer is (C). When the time equals .375 seconds, the pendulum is 3/4 of the way through the first half of its period. At that time, if the pendulum string breaks, the pendulum will fly off at a 45 degrees angle, which is the angle that gives the pendulum bob maximum time of flight.

The correct answer is (D). The apparent weight is zero. The person is in free fall. No forces are acting on the person except gravity.

The correct answer is (D). The ideal gas law equation

The correct answer is (E). Use conservation of momentum for the problem.

The correct answer is (B). When a light ray enters an optically denser material, it bends toward the normal because the light slows down in the material.

Combining the equation E = hf with f = c/ λ gives us (2mFe)(2cFe)(delta)TAl = mFecFe(delta)TFe ⇒ 4(delta)TAl = (delta)TFe

By Newton's third law, the force on the heavier person is equal but opposite to the force on the lighter person, eliminating A and B. Since the lighter person has the mass of the heavier person and acceleration is inversely proportional to mass, the magnitude of the lighter person's acceleration will be twice that of the heavier person.

The correct answer is (D). The acceleration affects the spider in the same way that it affects the observer. If the elevator were in free fall, everything in the elevator would free fall together, including the spider. If the elevator accelerates upward, the spider experiences an apparent gain in weight, just as a person riding in the elevator does.

The correct answer is (C). The water vapor in the can is hot and at atmospheric pressure. Cooling the can quickly condenses the water vapor, which also reduces the pressure inside the can. The outside atmospheric pressure is greater, thus crushing the can.

The period of the spring-block simple harmonic oscillator is given by the equation T = . So, to make T as small as possible, we want m to be as small as possible and k to be as large as possible. Since m2 is the smaller mass and k1 is the larger spring constant, this combination will give the oscillator the shortest period.