A ball is thrown horizontally from the roof of a building 56 m tall and lands 45 m from the base. What was the ball's initial speed?

A roller coaster in the figure below starts at the top of a straight track that is inclined 30° with the horizontal. This causes it to accelerate at a rate of 4.9 m/s2 (1/2 g). What is the roller coaster's speed after 5 s? in m/s.

3 light bulbs with resistances of 20, 15, and 45 are powered by a 9v battery. What type of circuit should the light bulbs be placed in for the most power

The density of an object is 1.23 g/cm3. In which of the following materials will it float A. Water B. Olive oil C. Ethyl Alcohol D. Citric Acid

What kind of substances diffuse most through a cell membrane

Who is known as the father of chemistry because he first organized all known elements into four different groups

The voltage across the primary winding is 350,000 V, and the voltage across the secondary winding is 17,500 V. If the secondary winding has 600 coils, how many coils are in the primary winding? 30 583 12000 332500

A 200 watt t. v. is used for 20 hours in a week. If it is used for four weeks then what is cost of electricity if rate is 5rs/kwh

In an experiment, the control is never changed by the scientist not important to the scientist not recorded by the scientist changed by the scientist

When you catch a baseball, what kind of work do you do, negative or positive? by catching the ball, what do you change? what energy does it gain or lose?

All describe work except A) a team of dogs dragging a sled B) a jokey sitting on a horse C) a bowler lifting a bowling ball