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Question: You are driving your truck down a small street at 30 mph (13.4 m/s). Approaching a stop sign, you put on the brakes and come to a stop 10 seconds later. (Friction can be neglected here because the truck is rolling.)
For the following two questions, SKETCH a diagram showing the relevant variables, motion, and quantity you are solving for. Clearly show which equations you will use, and any algebra or arithmetic. Finally, comment on whether or not your results seem reasonable.
(a) First, what is the (average) braking force of the truck? (Your car weighs about 3300 lbs, which corresponds to a mass of 1500 kg.)
(b) Second, at the hardware store, you load EIGHT 100 lb bags of sand in the back of your truck (100 lb has a mass of 45 kg). Your truck's braking force is what you calculated above. How long will it now take you to make the same stop? (I.e., you are going 30 mph and then put on the brakes. How long until you stop?)
A solid cylinder of mass 2.00kg and radius 1.50x10^-2m is free to rotate on a frictionless axle. determine the acceleration of the falling mass
A series RCL circuit contains a 47.0 ohm resistor, a 2.00 microF capacitor, a 4.00 mH inductor, and a generator with a frequency of 2550 Hz and Emax of 60V. what is the average power dissipated by the resistor
An astronaut who is repairing the outside of her spaceship accidentally pushes away a 96.7-cm-long steel rod, What is the magnitude of the EMF, in millivolts, induced between the ends of the rod
A bullet of mass .004 kg is fired horizontally into a wooden block of mass 1.3 kg resting on a horizontal surface. The coefficient of kinetic friction between block and surface is 0.2. The bullet remains embedded in the block, which is observed to..
Must show all work and calculations!!!! A primitive yo-yo is made by wrapping a string several times around a solid cylinder with m=200g and r=10cm. Find the tension in the string and the acceleration of the cylinder
The train passes point A with a speed of 30 m/s and begins to decrease its speed at a constant rate of at = -0.25 m/s2. Determine the magnitude of the acceleration of the train
One of your friends pulls on a rope with 3 units of force and other pulls on a second rope with 5 units of force, How hard and what direction must you pull
How fast should the car is traveling just as it leaves the cliff in order just to clear the river and land safely on the opposite side
Ice of mass 48.5 g at -10.3° C is added to 188 g of water at 14.2° C in a 108 g glass container of specific heat 0.200 cal/g-°C, obtain the final temperature of the system
A rubber ball is vigorously rubbed with a piece of fur, which gives the ball a charge of -69.6 nC. To the nearest tenth of a nanocoulomb, what must be the charg
A simple pendulum uses a steel wire as the "string." The length of this wire is 1.5 m at room temperature. What is the change in the period of the pendulum
Determine the autocorrelation of a cosine wave x(t) = A cos t, and plot it against T.
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