Projectile Motion: A boy throws a rock with an initial velocity of 3.13 m/s at 30.0° above the horizontal. How long does it take for the rock to reach the maximum height of its trajectory if air resistance is negligibly small and g = 9.80 m/s2?

When a 12-V battery powers a single 6-ohm lamp,

Discrete radii and energy states of atoms were first explained by electrons circling the atom in an integral number of

In casually observing a cup of tea you are

Projectile Motion: An athlete competing in the long jump leaves the ground with a speed of 9.14 m/s at an angle of 35° above the horizontal. How long does the athlete stay in the air, assuming no significant air resistance?

Newton’s Second Law in 1 Dimension: A net force of 125 N is applied to a certain object. As a result, the object accelerates with an acceleration of 24.0 m/s2. The mass of the object is

Projectile Motion: You throw a rock horizontally off a cliff with a speed of 20 m/s and no significant air resistance. After 2.0 s, the magnitude of the velocity of the rock is closest to

General Questions: A box is placed on a table which rests on the floor. The box pushes on the table; the reaction force to the box’s push on the table is the table’s push on the floor.

The Heisenberg uncertainty principle states that

In its 1954 ruling in Brown v. Board of Education of Topeka Kansas, the U.S. Supreme Court reversed an interpretation of the ________ Amendment that an earlier court in 1896 had made in Plessy v. Ferguson which had established the “separate but equal” clause.