i need help with these questions?

Question

1.What is the momentum of a 39.2 N bowling ball with a velocity of 7.0 m/s?


2.On earth where the acceleration due to gravity is 9.80 m/s2, in Newtons, how much does a 60.0 kg person weigh?

3.An object has a volume of 75.0 cm3 and a density of 14.9 g/cm3. What is the mass of this object in grams?

4.A braking force of 3,000.0 N accelerates a car from 57.8 m/s to rest in 8.2 seconds. What is the mass (in kilograms) of the car?

5.If the Sun is a distance of 1.5 × 1011 m from Earth, how long does it take sunlight (in seconds) to reach Earth if it moves at 3.0 × 108 m/s?

Answer 1

1. I will assume the bowling ball is not spinning, so
momentum =m*v, using g=9.8
momentum=39.2*7.0/9.8

2. Weight is a force, so
weight=60.0*9.80

3. Multiply the volume times density to get
75.0*14.9

4 The equations of interest are
F=m*a and v(t)=v0-a*t
first, find a from the velocity equation
0=57.8-a*8.2

now use F=m*a to find m
3000.0=m*a

5. Distance divided by speed = time
1.5X10^11/(3.0*10^8)

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