What determines the length of a year for a planet

Heated lithium atoms emit photons of light with an energy of 2.961 * 10-19 j. what is the energy of 1.00 mol of these photons?

A 60 W light bulb at 120 V is left on in your house to prevent burglary, and the power charges 10 cents per kilowatt-hour, how much will it cost to leave the bulb on for 30 days?

Superconductors have no measurable resistance. true or false?

El vector a tiene componented ax = 2.70 cm, ay=2.25 cm; y el vector b tiene componentes bx = 0.30 cm, by = 1.75 cm. Calcular las componentes de la resultante a+b

Can someone tell me how to find acceleration with only using distance and time? It would be much appreciated

Are microwaves and radio waves faster or slower than other types of electromagnetic energy?

If you dive under-water, you notice an uncomfortable pressure on your eardrums due to the increased pressure. The human eardrum has an area of about 70 mm2 (7*10-5m2), and it can sustain a force of about 7 N without rupturing.

Why cant kinetic energy ever be greater than potential energy

For a stationary observer, when the source of a sound is moving, its pitch appears to change.

Give an example of each simple machine