Tony (of mass 45 kg) coasts on his bicycle (of mass 20 kg) at a constant speed of 7 m/s, carrying a 7 kg pack. tony throws his pack forward, in the direction of his motion, at 5 m/s relative to the speed of bicycle just before the throw. what is the initial momentum of the system (tony, the bicycle, and the pack)? answer in units of kg · m/s.

504 kg m/s

Explanation:

The total mass of the system (Tony, the bicycle, and the pack) is

M = 45 + 20 + 7 = 72 kg

Since momentum is defined as the product of mass and its speed. The total momentum of the system initially (before throwing the pack) when Tony is coasting at a speed of 7 m/s is:

P = MV = 72 * 7 = 504 kg m/s

a.) is the correct answer.

explanation:

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation: