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A car is moving down a flat, horizontal highway at a constant speed of 21.0m/s when suddenly a rock dropped from rest straight down from an overpass crashes through the windshield. The rock strikes the windshield at a right angle, and the windshield makes a 60º angle with the horizontal.
a. Find the speed of the rock relative to the car when it hits the windshield.
b. Find the distance above the point of contact with the windshield from which the rock was dropped.
c. If the driver had seen what was about to happen just as the rock was being released, how much time would she have had to react before the rock strikes the windshield?
Suppose that a police car on the highway is moving to the right at 30 m/s, while a speeder is coming up from almost directly behind at a speed of 31 m/s, both speeds being with respect to the ground. The police officer aims a radar gun at the speeder..
Dolphins have been observed swimming at sustained speeds of up to 11 m/s. According to the distinguished zoologist Sir James Gray, this speed can be achieved.
A 350 Ohm resistor is connected in series with a 30 milli-farad capacitor. If this arrangement is wired across a 12-volt battery, What is the initial voltage across the capacitor
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A particle leaves the origin with a speed of 3.3 times 10^6 m/s at 38 degrees to the positive x axis. It moves in a uniform electric field directed along positive y axis. Find Ey such that the particle will cross the x axis at x = 1.5 cm if the parti..
A step-up transformer is connected to a generator that is delivering 139 V and 110 A. what voltage is across the secondary
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The electric potential at a position located a distance of 22.2 mm from a positive point charge of 8.40×10-9C, Calculate the value of the second charge
A beam of light in the air makes an angle of 47.5 degrees with the surface (not the normal) of a glass plate having a refractive index of 1.66. (a) what is the angle between the reflected part of the beam and the surface of the glass?
A 1000 kilogram automobile rounds a curve of a radius of 70 meter at 23m/s, and the banking angle is 38o for no friction to be between the road and tires. Then what banking angle must the curve have
A football is kicked such that is has an initial velocity of 30 m/s at an angle of 60 degrees above the ground. How would you calculate its maximum height
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