Part 1) Three lead balls of mass m 1 = 17 kg, m 2 = 26 kg, and m 3 = 9.1 kg are

Question

Part 1) Three lead balls of mass

m1 = 17

kg,

m2 = 26

kg, and

m3 = 9.1

kg are arranged as shown in the figure below. Find the total gravitational force exerted by balls 1 and 2 on ball 3. Be sure to give the magnitude and the direction of this force.

Part 2)A car is pushed along a long road that is straight, horizontal, and parallel to the x direction.

(a) The horizontal force on the car varies with x as shown in the figure. What is the work done on the car by this force? (Let a = 500 N.)

Three lead balls of mass m1 = 17 ka, m2 = 26 kg, and m3 = 9.1 ka are arranged as shown in the figure below. Find the total gravitational force exerted by balls 1 and 2 on ball 3. Be sure to give the magnitude and the direction of this force magnitude 7.15 direction145.4 counterclockwise from the +x-axis y (m) 4 1 x (m) 1234 5 m 0

Explanation / Answer

a)The work done will be area under the given graph

W = 1/2 (4a - a) x (xf - xi)

W = 0.5 x (4 x 500 - 500)( 24 - 2) = 16500 J

Hence, W = 16500 J

b)Work dobe by the gravity will be zero, since there is no gain in vertical height.

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