a car moves from a to b at a speed of 50km per hr and comes back from b to a at a speed of 30km per hour. find its average speed during the journey

Which type of eclipse would you expect to see when the moon passes directly through the moon and the sun?

A radio wave has a frequency of 3.20 * 108 hz. what is the energy (in j) of one photon of this radiation? enter your answer in scientific notation. * 10 j

Which of the following best summarizes what we mean by dark matter? Matter for which we have theoretical reason to think it exists, but no observational evidence for its existence.

Which of the following tools should a scientist use to measure an object in milligrams? a. Electronic balance b. Pan balance. c. Tape measure d. Thermometer

After the pendulum is dropped, determine the height at which the kinetic energy is equal to the potential energy.

A spring tide can occur at what day and month?

For a given launch velocity, at which launch angle does the projectile undergo the maximum horizontal displacement

Electric force is blank proportional to the amount of charge and blank proportional to the square of the distance between the charges

What happens in the gray zone between solid and liquid?

Which statement describes Newton's law of universal gravitation? Mass has hittle effect on gravity between objects. Gravity pushes objects away from Earth's center, Gravity does not act between Earth and the moon.