# physic

1.What is the gravitational force between two trucks, each with a mass of 2.0 x 10^4 kg, that are 2.0 m apart? (G = 6.673 x 10^11 N•m^2/kg^2)

2.Each tire of an automobile has an area of 0.026 m^2 in contact with the ground. The weight of the automobile is 2.6 10^4 N. What is the pressure in the tires?

3.A bowling ball has a mass of 7.0 kg, a moment of inertia of 2.8 × 10^-2 kg·m^2 and a radius of
0.10 m. If it rolls down the lane without slipping at a linear speed of 4.0 m/s, what is its
total kinetic energy?

1. Use Newtons Gravitaional law.
2. Pressure = weight on tire/ area

3. KE = 1/2 mv^2 + 1/2 Iw^2

but w= v/r

so KE= ......

what is the gravitational force between two trucks, each with a mass of 2.0*10^4kg, that are 2.0 m apart?

a motorcycle daredevil is attempting to jump across as many buses as possible. The take off ramp makes an angle18.8dreg above the horizontal, and the landing rampis identical t the take off ramp. The buses are park side by side, and each bus is 2.74m wide. The cyclist leaves the ramp with a speed of v=32.5m/s. What is the maximum number of buses over which the cyclist can jump?

#2 = 250000Pascal

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asked by Jan

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