Explanation

If Cp = 10 and Cv = 7, then the value of the gas constant R can be calculated as the difference between the specific heats at constant pressure and constant volume: R = Cp − Cv = 10 − 7 = 3.

Explanation

If the mass is doubled, both angular and linear momentum will be doubled according to the conservation of momentum principle.

Explanation

If a positive charge is placed between two negative charges, the system will be unstable due to the repulsive forces between like charges.

Explanation

The escape velocity of Neptune is approximately 23.5 km/s.

Explanation

Passage

The sea-waves can cause a significant damage when they crash the lands. Under a clear sky and calm sea, a wall of water may appear twenty or thirty feet high over beaches, destroying houses and drowning residents in its path.

When a submarine earthquake happens, it is likely to cause an enormous amount of shock, disturbing the quite waters of the deep ocean. This disturbance transfers to the surface and forms a huge swell. The swells in the ocean are nearly a mile wide and rise to various multiple of ten feet in height.

Nothing was accomplished about tsunamis until after the second World War. These waves travel towards the land hundreds of miles an hour, and you can imagine that how they would crash!

Question 1: An aspect of the waves is the fact that they

(A) are produced by deep swells

(B) often strike during clear weather

(C) arise under conditions of cold temperature

(D) are formed in concentric patterns

Question 2: These destructive waves are caused by

(A) storms

(B) concentric time belts

(C) underwater earthquakes

(D) seismic changes

Question 3: The normal maximum width of the waves is approximately

(A) one mile

(B) five miles

(C) five feet

(D) ten feet

Question 4: Nothing was done about the waves until

(A) a solution was found

(B) deaths occurred

(C) severe damage was incurred

(D) the outbreak of World War II

Question 5: The motion of the waves has been calculated at a speed of

(A) 1 kilometer an hour

(B) 50 miles an hour

(C) 100 miles an hour

(D) more than a hundred miles an hour

Explanation

In an AC generator, the angle between the magnetic field and the coil changes continuously as the coil rotates. This angle change determines the phase difference between the generated AC voltage and the magnetic field.

Explanation

If the radii of two droplets are in the ratio of 2:3, then their terminal velocities will be in the ratio of the inverse square of their radii. Since the terminal velocity is proportional to the square of the radius, the ratio will be:

(3/2)2 : (2/3)2 = 9/4 : 4/9.