Amarble is flicked off the edge of a table. the motion of the marble follows a parabolic path.

which is true about the motion of this marble?

a.
no continuous forces are acting.

b.
two continuous forces are acting on the marble.

c.
only one continuous force is acting on the marble.

d.
two instantaneous forces are acting on the marble.

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.

Most of the volume of an atom is occupied by the