Ancient physicists tried to determine the orbits of the planets. Every night they carefully tracked the location of the planets and stars they observed. What kind of investigation were these physicists conducting?

A child walks due east on the deck of a ship at 2 miles per hour. the ship is moving north at a speed of 18 miles per hour. find the speed and direction of the child relative to the surface of the water.

What is the name of the ionic compound Cs2S

A car moves with a speed of 40km/he for 15 minutes and then with a speed of 60km/hr for the next 15 minutes. Find the total distance covered by the car

A charge of 9.0 * 10-5 C is placed in an electric field with a strength of 4.0 * 104. What is the electrical force acting on the charge?

How much energy, in Joules, is needed to raise the temperature from 25.87°C to 33.16°C in a 2.66 kg block of each of the following materials? Silver has a specific heat of 0.235 J/g·K, iron has a specific heat of 0.

Which of the following is an example of convection? A. hot air rising and cooler air falling B. a hot object transferring heat to a cooler one C. a hot oven warming the air around it D. the rays of the Sun warming the earth

A 50,000 kg locomotive is traveling at 10 m/s when its engine and brakes both fail. How far will the locomotive roll before it comes to a stop? Assume the track is level.

A rectangular loop of wire with sides 0.262 and 0.401 m lies in a plane perpendicular to a constant magnetic field (see part a of the drawing). The magnetic field has a magnitude of 0.

In the system you're inspecting the damper motor isn't working, You decide to see if the damper-postion sensor us sending the proper signal to the which then signals the damper motor. A. heating coil B. duckwork c. energy source D. controller

Which of the following statements does not describe the structure of an atom? a. An atom has a small, dense center called the nucleus. b. Inside the nucleus of an atom are protons and electrons. c. Protons are positively charged sub-atomic particles.