ty-applied foron wil accelerate a 200-kg crae at 1 m What horizontally-applied f

Question

ty-applied foron wil accelerate a 200-kg crae at 1 m What horizontally-applied foro 3. noor against a friction force haif its weight? B) 1200N A) 600 N C) 1600 N D) 2400N E) of 4. A 2-kg chunk of putty moving at 5 m's collides with and sticks to a 3-kg bowing ba at rest. The bowling ball and putty then move with a velocity of A) 0 m/s. B) 1 m/s. C) 2 m/s. D) 5 mis. E) mone thn 5m 5. Danny Diver weighs 500 N and steps off a diving board 5 m above the water Danny hs the water with kinetic energy of E)none of the above D) 5100J. A) 2500 J. B) 2510 J

Explanation / Answer

3.

Using Force balance

Fnet = F - Ff

Ff = W/2 = m*g/2

Fnet = m*a

m*a = F - m*g/2

F = m*(a + g/2)

F = 200*(1 + 10/2) = 1200 N

Correct option is B.

4.

In this type of collision:
using moment conservation
Pi = Pf
m1v1 + m2v2 = M*V
where M = m1 + m2
V = (m1v1 + m2v2)/(m1 + m2)

V = (2*5 + 3*0)/(2 + 3)

V = 2 m/sec

Correct option is C

5.

Using energy conservation

dKE = dPE

0.5*m*V^2 = m*g*h

W = m*g

m = 500/10 = 50 kg

V = sqrt (2*g*h)

V = sqrt (2*10*5)

V = 10 m/sec

KE = 0.5*m*V^2

KE = 0.5*50*10^2 = 2500 J

Correct option is A

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