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A) A lightweight electric car is powered by ten 12-V batteries. At a speed of 70 km/h, the average frictional force is 1050 N. What must be the power of the electric motor if the car is to travel at a speed of 70 km/h?
B) If each battery can deliver a total charge of 180 Ah before recharging, what is the total charge in coulombs that can be delivered by the ten batteries before recharging?
C) What is the total electric energy delivered by the ten batteries before recharging?
D) How far can the car travel at 70 km/h before the batteries must be recharged?
E) What is the cost per kilometer if the cost of recharging the batteries is 9 cents per kilowatt-hour? (Give your answer in cents. Don't give units)
Use 9.81 for the magnitude of the acceleration due to gravity.
q1. a long straight wire is in the plane of the page and carries a current of a. point p is also in a plane of the page
q. a baby bounces up and down in her crib. her mass is 10.5 kg and the crib mattress can be modeled as a light spring
A 5.43 kg block free to move on a horizontal, frictionless surface is attached to one end of a light horizontal spring. find the speed of the block at the equilibrium position of the spring
In 1975 the roof of Montreal's Velodrome, with a weight of 360 kN, was lifted by 10 cm so that it could be centered. How much work was done on the roof by the forces making the lift.
q1. a 500 g rubber ball is dropped from a height of 10 m and undergoes a completely elastic collision with the earth.a
Consider a book of mass 10 kg on a frictionless incline that makes an angle of 40? with the horizontal. Find the acceleration of the book down the incline
Assume the balloon and rod to be point charges. The Coulomb force constant is 1/(4? ?0) = 8.99 × 10^9 N·m2/C2 and the acceleration due to gravity g = 9.81 m/s2.
The crates are pulled to the right at a constant acceleration 3m⁄s^2 by a horizontal force F. Calculate (a) the magnitude of the force F and (b) the tension in the rope connecting the blocks. Include the free body diagram or diagrams you used.
Two charges, +q and -q, are located in the x-y plane at points (0,+d/2) and (0,-d/2), respectively. Calculate the magnitude of the electric field at point P with the superposition principle
the speed of hockey pick decreases from 45.00 to 44.67 m/s in coasting 16 m across the ice. find the coefficient of kinetic friction between the puck and the ice
A moth at about eye level is 11 cm in front of a plane mirror; you are behind the moth, 25 cm from the mirror. What is the distance between your eyes
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