Home Work 1. What is the weight of a 20o kg object? 2. A woman exerts a force of

Question

Home Work 1. What is the weight of a 20o kg object? 2. A woman exerts a force of 500 N straight up.to lift a 35 kg basket. What is the acceleration of the basket? 3. An elevator of mass 3000 kg is ascending at a stea 2.0 m/s. W c dy speed of is the ore in the cable supporting the etor? ° 4. A 49-N block is pulled by a horizontal force of 50.0 N along a rough horizontal surface at a constant acceleration of 6 m/s What is the coefficient of friction? 4. Consider a car that starts at rest and accelerates at 2m/s2 for 3 seconds. HOMEWORK At that time, t 3 s, how fast is it going? and how far has it gone?

Explanation / Answer

1) given mass = 200 kg

weight w = mg

w = 200*9.8 = 19600 N

2) from newtons second law

f = ma

a = f/m

a = 500/35 = 14.29 m/s^2

3) tension T = ma+mg

here a = 0 because lift is moving with constant speed

T = mg

T = 3000*9.8 = 29400 N

4) here net force = ma

net force = F-f = ma

m = 49/9.8 = 5 kg

f is the friction = mue*N = mue*w

f = mue*49

50-mue*49 = 5*6

mue*49 = 50-30 = 20

mue = 20/49 = 0.408

5) given initial speed = 0

a = 2 m/s^2

t = 3 sec

a) v = u+at

v = 2*3 = 6 m/s

b) s = ut+1/2at^2

s = 0+1/2*2*3^2

s = 9 m

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