Abowling ball of mass 8 kg hits a wall going 5 m/s and rebounds at a speed of 4 m/s. what was the impulse applied to the bowling ball?
a. 40 kg'm/s
b. 32 kg'm/s
c. 72 kg'm/s
d. 8 kg'm/s

Impulse, J = 72 kg-m/s

Explanation:

It is given that,

Mass of the ball, m = 8 kg

Initial velocity of the ball, u = 5 m/s

Final velocity of the ball, v = -4 m/s (as it rebounds back)

We need to find the impulse applied to the bowling ball. We know that impulse is equal to the change in momentum of an object i.e.

J = -72 kg-m/s

Negative sign shows the impulse is applied in opposite direction. So, the correct t option is (c). Hence, this is the required solution.

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: