How many experiments are needed to prove a theory

A vacuum chamber contains a uniform electric field directed downward. If a proton is shot horizontally into this region, it's acceleration is? Give direction and relative magnitude (Ex 45 degrees west of north, and is exponentially decreasing)

Why does an astronaut weigh less on the moon than on Earth? a. The astronaut has less mass on the moon. b. The astronaut is farther from Earth's center when he or she is on the moon. c.

The mechanical energy of a football during a pass is A. potential energy B. kinetic energy C. gravitational potential energy D. potential and kinetic energy

Small paragraph explaining how how potential and kinetic energy are related

A horizontal platform in the shape of a circular disk rotates on a frictionless bearing about a vertical axle through the center of the disk. The platform has a mass of 117.0 kg, a radius of 2.00 m, and a rotational inertia of 4.

How much would a 100kg man weigh on the surface of the sun where the acceleration is 274 m/s

How much current is in a circuit that includes a 9 - volt battery and a bulb with a resistance of 12 ohms?

Find the current Voltage VD and current ID in the following circuit assuming (a) ideal diode. (b) Constant voltage drop model with Von = 0.75V (c) using the exponential model (I_0=1*10^ (-14)). Verify your results through Multisim simulation

Suppose two stars are located in region a of the h-r diagram shown in the figure below. Star X appears much dimmer that Star Y as seen from Earth. Which Star can be inferred to be nearer to Earth, and how do you know?

A student examining a joint observes collagen-rich connective tissue fibers linking the bones, but finds no synovial cavity. Which structural classification fits the observed joint?