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A moderate wind accelerates a pebble over a horizontal xy plane with a constant acceleration. At time t = 0, the velocity is. What are the (a) magnitude and (b) angle of its velocity when it has been displaced by 13.0 m parallel to the x axis?
Suppose that a police car on the highway is moving to theright at 27 m/s, while the speeder is coming up from behind at aspeed of 39 m/s, both speeds being with respect to the ground. Which wave has the greater frequency
If a projectile is launched vertically from the Earth with a speed equal to the escape speed, how far from the Earth's center is it when its speed is 1/6 of the escape speed
A spinning flywheel has rotational inertia I = 417 kg·m2. Its angular velocity decreases from 19.5 rad/s to zero in 320 s due to friction. What is the frictional torque acting? Take positive to be "with the flywheel's rotation", and negative to be "o..
A player uses a hockey stick to increase the speed of a0.200kg hockey puck by 6 m/s in 2 seconds. How much did the hockey puck accelerate
The manufacturers of a particular brand of car conduct head-on collision tests and find that in the absence of a passenger side air bag, What is the average force exerted on the childs head during collision
A cyclotron for accelerating deutrons (A deuteron has one proton and one neutron ) has a magnetic field of .5 T and a radius of 1 m. What is the energy of the deuteron
A jeweller’s lens of focal length 1.7 cm is utilized as a magnifier. With the lens held near the eye, decide the following. What is the object distance giving the maximum magnification? What is the angular magnification when the object is at the foca..
A 100 kg running back is moving with a speed of 4.0m/s. What average force must be applied to stop him in 0.25 s
Very fine smoke particles are suspended in air. The translational rms speed of a smoke particle is 2.3 x 10-3 m/s, and the temperature is 285 K. Find the mass of a particle.
The current density inside a long, solid, cylindrical wire of radius a = 4.8 millimeter is in the direction of the central axis, Evaluate the magnitude of the magnetic field at a distance r = 2.6 millimeter from the center
Find the potential 1.18 cm from a proton. The Coulomb constant is 8.9876 × 10^9 N m^2/C^2 and the elemental charge is 1.602 × 10^?19 C
In addition, snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. Find out the acceleration of the sled and child.
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