Why is hydrogen set apart from the other elements in the periodic table

What is the height of a building (in meters) if it takes a rock 3.8 seconds to drop from its roof?

List three observations that show how light carries energy.

The top of a 20-foot ladder leans against a wall, and the bottom of the ladder slides away from the wall at a rate of 5 ft/sec.

Which of the following must occur in order for work to be done? A. The object must use a machine. B. The object must move. C. The object must make another object move. D. The object must not move.

Astronomers use radio waves to learn about the universe. Radio waves travel light-years through space before reaching Earth. Radio waves must be which type of wave

You create a transformer by wrapping wire around an iron nail. The number of turns are: Primary (500); Secondary (2500). The Primary voltage is 3.00 V. The Secondary current is 200 mA.

A 90kg cannon fires 100kg shell with muzzle velocity of 75m/s. Calculate the recoil velocity of the cannon relative to the ground

The planet XYZ traveling about the star ABC in a circular orbit takes 24 hours to make an orbit. Assume that the orbit is a circle with radius 89 comma 000 comma 00089,000,000 mi. Find the linear speed of XYZ in miles per hour.

Your heart pumps 80 g of blood with each beat. The blood starts from rest and reaches a speed of 0.60 m/s in the aorta. If each beat takes 0.16 s, the average force exerted on the blood is a. 3.0" 102 N b. 0.22 N c. 0.16 N d. 0.30 N e. 0.98 N

What is the formula for calculating the mass when i have the number of volume and density