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A car traveling at 90 km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.79 m. What was the magnitude of the average acceleration of the driver d
David is driving a steady 30.0 {rm m/s} when he passes Tina, who is sitting in her car at rest. Tina begins to accelerate at a steady 2.0 {rm m/s^2} at the instant when David passes How far does Tin
Charge is uniformly distributed around a ring of radius R = 2.40 cm and the resulting electric field magnitude E is measured along the ring's central axis (perpendicular to the plane of the ring). A
How much time will elapse between the gun firing and the bullet hitting the ground?
Suppose the highway is icy and the coefficient of friction between the tires and pavement is only one-third what you found in part (a). What should be the maximum speed of the car so it can round th
Two students are on a balcony 18.0 m above the street. One student throws a ball (ball 1) vertically downward at 10.2 m/s; at the same instant, the other student throws a ball (ball 2) vertically up
At the end of the firing period, the craft has velocity components of vx = 3715 m/s and vy = 4144 m/s. Find the magnitude and direction of the initial velocity. Express the direction as an angle wit
The coefficient of static friction between the picture and the wall is 0.660. What is the minimum amount of pressing force that must be used?
Suppose the waste heat could be used to heat homes during the winter instead of being discharged into the ocean. A typical American house requires an average 20;rm kW for heating. How many homes cou
A painter of mass 70.0 kg stands on a platform of mass 75.0 kg and pulls on two ropes which hang over pulleys. He pulls each rope with a force of 750.0 N. Assuming a coordinate system where +y is up
Suppose the roller coaster in the figure (h1 = 37 m, h2 = 10 m, h3 = 25) passes point A with a speed of 1.20 m/s. If the average force of friction is equal to one sixth of its weight, with what spee
You are on an airplane that flies horizontally with a speed 1000km/h when an engine falls. Neglecting air resistance, assume it takes 30s for the engine to hit the ground.Show that the horizontal di
A 10.1 kg object oscillates at the end of a vertical spring that has a spring constant of 1.80 * 10^4 N/m. The effect of air resistance is represented by the damping coefficient b= 3.00 Ns/m. (a) Ca
The block drops a distance h. The rope does not slip on the pulley, and the magnitude of the acceleration due to gravity is g. You know I,r,m,h,and g. What is the work done by gravity on the system?
The rocket attains its launch speed in a negligibly short period of time, after which its engines shut down and the rocket coasts. By how much does the rocket clear the top of the wall?
A child slides down a slide with a 25° incline, and at the bottom her speed is precisely two-thirds what it would have been if the slide had been frictionless. Calculate the coefficient of kinet
Sam, whose mass is 85 kg, takes off accross level snow in his jet powered skis. The skis have a thrust of 189 N and a coefficient of kinetic friction on snow of 0.1. Unfortunatately, the skis run o
You are driving to the grocery store at 22 {rm m}/{rm s}. You are 110 {rm m} from an intersection when the traffic light turns red. Assume that your reaction time is 0.78 {rm s} and that your car br
The results of this experiment allow one to find . Find the ratio for this particle.
The leg and cast in the figure below weigh 210 N, with the center of mass as indicated by the blue arrow in the diagram. The counterbalance w1 weighs 125 N. Determine the weight w2 and the angle &al
A car starts from rest moving w constant acceleration of 2.0 m/s2 for 10s, then travels w constant speed for another 10s, and slows to a stop w constant acceleraton of -2.0 m/s2. how far does it tra
A copper-bottomed kettle, its bottom 24 cm in diameter and 3.0 mm thick, sits on a burner. The kettle holds boiling water, and energy flows into the water from the kettle bottom at 800 W. What is th
Consider a harmonic electromagnetic plane wave with angular frequency ω and propagation vector k=(kx,ky,kz) (i.e., propagating in an arbitrary direction). The electric field vector is E=(Ex,Ey
At time a grinding wheel has an angular velocity of 26.0 . It has a constant angular acceleration of 31.0 until a circuit breaker trips at time = 2.10 . From then on, the wheel turns through an angl
Instructions for finding a buried treasure include the following: Go 660.4 paces at 255?, turn to 132? and walk 295 paces, then travel 420 paces at 195?. Find the magnitude of the resultant displac