The orbits of planets being elliptical was one the planetary laws developed by

A. Copernicus.

B. Ptolemy.

C. Kepler.

D. Brahe.

What family of elements has 7 valence electrons?

Coal is considered to be a non-renewable energy source. Which of the following statements is correct? a. Coal is a scarce resource. b. Coal is an unlimited resource. c. Coal is a non-scarce resource. d. Coal is not a resource.

A particle is in uniform circular motion. Assume a standard rtz coordinate system. If you deconstruct the net force acting on the particle along each of these axes (r (radial), t (tangential), and z (perpendicular to the plane of motion), how many

Using one or more of your senses to gather information is

There are 152 steps between the ground floor and the sixth floor in a building. Each step is 16.2 cm tall. It takes 3 minutes and 35 seconds for a person with a mass of 59.5 kg to walk all the way up. How much work did the person do?

A cell provides 6 V to an LDR. The current through this LDR is measured and is found to be 3 A. What is the resistance of the LDR?

A car travels along eastward with a constant velocity. the magnitude of the acceleration of the car is

What is the weight of a 65 kg astronaut on mars?

When lava cools, what type of Rock forms?

A uniformly charged conducting sphere of 1.1 m diameter has a surface charge density of 6.2 µC/m2. (a) Find the net charge on the sphere. (b) What is the total electric flux leaving the surface of the sphere?