On a calm, windless day, a fisherman in his fishing boat turns on a battery PA d

Question

On a calm, windless day, a fisherman in his fishing boat turns on a battery PA degree rear of the boat. In this process the: Boat moves backward Boat moves forward Boat moves to the right d. Boat stays stationary None of the above A 10 g bullet travelling at 200 m/s hits and penetrates a thick wooden board to a depth of 5.0 cm. The average force exerted by the wooden board is: a. 4.0 Times 10^3 A tow truck accelerating at 2.4 m/s^2is pulling a 1250 kg car by means of a chain of negligible mass, tension in the chain is: A small ball moving along a straight line has the magnitude of momentum, as a function of time, given by p(t) = (3.0t + 4.0 t^3/2) (in SI units). The external force acting on the hall at t 4 0s is The gravitational acceleration on the surface of Jupiter is 2.6 tunes its value on Earth It an astronaut weighs 770 N on earth, what is his weight on the surface of Jupiter? A child is pulling her wagon along an incline. If the coefficient of static friction between the wagon wheels and the incline is 1.1, what is the maximum angle of the incline that she can climb at constant speed? A rear-wheel-drive vehicle has 40% of its weight on the front axle. What maximum acceleration can it attain on a road where the tires-on-the road static friction coefficient is 0.85?

Explanation / Answer

(1) the boat will remain stationary. option d is correct

(2) work done= change in kientic energy

W= Kf-Ki

Fd = 1/2mVf^2 - 1/2mVi^2

Vf=0

F(0.05) = 1/2 (0.01)(0) -1/2 (0.01) (200)^2

F(0.05) = 200

F= 200/0.05 = 4x10^3 N . so option a is correct .

(3) acceleartion= a= 2.4 m/s^2

mass= m= 1250 kg

Tension= m a = 1250 (2.4)=3000 N= 3kN. so option a is correct .

(d) F= dp/dt = d(3t+4t3/2)/dt = 3+6t1/2

so at t= 4 seconds, F= 3 + 6 (4)1/2= 15 N.so option b is correct .

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