10 - Center of mass, Impulse, momentum, variable mass

The adjacent hoop has a diameter of 1 meter, what are the coordinates of its centre of mass

• 1,1
• 0.5,1
• 0.5,0.5
• 1,0.5

Question 16: Carmelita mass

• 50

• 58

• 34

• 40

Question 17: Distancia del perro a la orilla

• 1.84

• 1.92

• 0.44

• 0.13

Answer a: Maximum height of com

• 4.59

• 5.73

• 6.11

• 7.65

An object of mass m =2 kg experiences a force as shown in the force-time graph. Over the 5 seconds, what is the total change in momentum?

• 35 kg m/s

• 70 kg m/s

• -35 kg m/s

• -70 kg m/s

• None of these

• 33.6

• 48.2

• 1.20

• 0.83

A cannon is mounted on a cart, and carrying a cannonball. The total mass of the cart, cannon, and ball is M, and the cart is rolling with no friction at a velocity v in the positive x-direction as shown above. The ball, of mass m, is fired with a velocity of vball in the positive x direction. What is the velocity of the cart and cannon after the ball is fired?

• (Mv-mv_ball)/(M-m_ball)

• (Mv-mv_ball)/M

• (v-mv_ball)/m_ball

• (Mv+mv_ball)/(M-m_ball)

• (-Mv-mv_ball)/(M+m_ball)

• 850

• 986

• 425

• 493

• 0.18

• 0.11

• 640

• 10.7

• 0.50

• 0.20

• 1.00

• 1.41