A ball is thrown upward from the ground with an initial speed of 15.6 m/s; at the same instant, another ball is dropped from a building 20 m high. after how long will the balls be at the same height above the ground?

Three resistances 2 ohm, 3ohm and 5 ohm are connected in parallel and a potential difference of 20V is applied across the terminals of combination. The potential difference across 3 ohm resistance is:

The interference pattern seen when light passes through narrow, closely spaced slits, is due to 1) diffraction. 2) reflection. 3) refraction. 4) dispersion. 5) deflection.

Mercury's natural state is where the atoms are close to each other but are still free to pass by each other. In which state (s) could mercury naturally exist? gas liquid solid or liquid solid or gas

If you weigh 690 N on the earth, what would be your weight on the surface of a neutron star that has the same mass as our sun and a diameter of 25.0 km? Take the mass of the sun to be ms = 1.99*1030 kg, the gravitational constant to be G = 6.

Which two forces act directly on objects that are unable to be viewed by the unaided eye? electromagnetic and strong gravitational and electromagnetic strong and weak weak and gravitational

A ___ is awarded to the opposing team when that team violently or dangerously charges a opponent. (in soccer) A) Goalie kick B) Indirect kick C) Direct kick D) Throw in

Which has greater potential energy, a book on the top shelf of a bookcase or a book on the bottom shelf? Why?

Fusion occurs with atoms of elements less massive than a. iron. b. helium. c. calcium. d. uranium.

Which describes what happens when fuel is ignited in a heat engine? A. Chemical energy is converted into thermal energy B. Thermal energy is converted into solar energy. C. Solar energy is converted into chemical energy D.

What happens during the intake and compression strokes of a four stroke engine?