An electron has a constant acceleration of + 2.9 m/s2. At a certain instant its velocity is + 8.6 m/s. What is its velocity (a) 2.1 s earlier and (b) 2.1 s later?

A 30.0-kg child sits on one end of a long uniform beam having a mass of 20.0 kg, and a 40.0-kg child sits on the other end. The beam balances when a fulcrum is placed below the beam a distance 1.10 m from the 30.0-kg child. How long is the beam?

A large bypass ratio turbofan engine has the following design and limit parameters: M0 = 0.8, altitude = 37 kft U. S. standard atmosphere, πd = 0.995, πc = 40, ec = 0.90, α = 6, πf = 1.6, ef = 0.90, πfn = 0.98, fan nozzle is convergent, τλ = 7.

What is the thickness of a human hair?

Which of the following is consider clean energy

A rock weighs 30 n on earth and another rock weighs 30 n on the moon. which rock has the greater mass?

Ways that charges can be transferred

If you drive at 100 km/hr for six hours how far will you go

Chemical bonds are formed from the attractive force of atoms for electrons. What is the force called?

How resistance, current, and voltage behave in a series circuit.?

A father racing his son has 1/3 the kinetic energy of the son, who has 1/2 the mass of the father. The father speeds up by 1.4 m/s and then has the same kinetic energy as the son. What are the original speeds of (a) the father and (b) the son