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1. At an accident scene on a level road, investigators measure a car's skid marks to be 88 m long. It is a rainy day. The coefficient of friction between the tires of the car and the road is estimated to be 0.42. Determine the speed of the car just before the driver slammed on the brakes. (Hint: Ff does work to stop the car.)
2. In the 1950s, an experimental train that had a mass of 25000 kg was powered across a level track by a jet engine that produced a thrust of 500000 N for a distance of 500 m. What would be the speed of the train after this distance?
The during an Apollo moon landing, reflecting panels were placed man the moon. find the distance between the astronomers and the moon
We used a 100g mass hung from the 10 cm mark on a meter stick. find the mass of the stick using method of torques
Three resistors with values of 2.7 , 3.8 , and 6.4 , respectively are connected in parallel in a circuit with a 24 V battery. How much current is delivered to the circuit by the battery
A typical lightbulb in your house is rated 137 W, which means that the lightbulb dissipates 137 W when connected to a DC voltage of 110V. what is the dissipated power
Three point charges are arranged along the x axis. Charge q1=-4 nC is located at x=0.240m and charge q2=2.10 nC is at x=-0.350m, What is the direction of the net force on q3
A bat emits a sound whose frequency is 91.20 kHz. The speed of sound in air at 20 degrees Celcius is 343m/s. However the air temperature is 38.8 degrees Celcius, so the speed of sound is not 343m/s. imagine that air behaves like an ideal gas, and ..
Two 40.0 µF capacitors in parallel are connected across a sinusoidal ac generator operating at 60.0 Hz. how much current passes through each capacitor
A skier moving at 4.50 m/s encounters a long, rough horizontal patch of snow having coefficient of kinetic friction 0.230 with her skis. How far does she travel on this patch before stopping.
A student sits at rest on a piano stool that can rotate without friction. The moment of inertia of the student-stool system is 4.4. find the resulting angular speed of the student and the stool
An alpha particle with a kinetic energy of 6.00MeV makes a head-on collision with a gold nucleus at rest. What is the distance of closest approach of the two particles
question1an old oaken buck of mass 6.75 kg hangs in a well at the end of a rope. the rope passes over a frictionless
A uniformly charged sphere has a potential on its surface of 450 V. What is the radius of the sphere
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