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A spring is stretched between two posts. When a pulse is produced at one end of the spring, it makes 4 back-and-forth trips along the spring in 3.4 s. If the pulse has a propagation speed of 12 m/s, how far apart are the posts?
Plutonium has a half life of 2.4 × 104 years. How long does it take for 99% of the plutonium to decay, What is the binding energy of the 4He nucleus
A skateboarder (m = 92 kg) takes a running jump onto a friend's skateboard that is initially at rest as sketched, What was the horizontal component of the velocity of the jumping skateboarder
On an exo-planet, a 70-kg astronaut steps on a scale and finds that the scale reads 246 N. A survival pack is dropped a distance 85 m to the ground. How fast will the survival pack be moving just before it hits the ground
A particle of mass m moving along the x-axis collides elastically with another particle of identical mass at rest in the lab frame and scatters. Its final momentum makes an angle theta with the x-axis in the lab. If its initial kinetic energy is K_0,..
A race car is moving with a velocity of 144 kilometers/hour. The driver applies the brakes, and the car comes to a halt in 12.0 seconds. What is the acceleration of the car after 12.0 seconds? A. -12 m/s^2 B. -3.3 m/s^2 C. 3.3 m/s^2 D. 10.3 m/s^2
A converging lens has a focal length of f = 22.0 cm. An object is placed 41.0 cm from the lens. Find the size of the image in cm if the object has a height of 4 cm. express answer with one decimal place.
A wire of diameter 0.750 mm and length 30.0 m has a measured resistance of 2.40 ?. What is the resistivity of the wire
write an algebraic expression for the total pressure on the diver at that point and calculate the total pressure on the diver in atms
A steel wire with mass 28.7 g and length 1.6 m is strung on a bass so that the distance from the nut to the bridge is 1.10 m. Calculate the wavelength of the string's vibration
A 0.500 kg block is attached to one end of a 4.00 g string. The other end of the string is secured to the center of a frictionless tabletop. What type of force must the tension in the string provide
A cylinder of brass has a diameter of 3mm and a length of 100mm. What is the stress in the cylinder
A crate of mass 10.2 kg is pulled up a rough incline with an initial speed of 1.60 m/s. What is the change in kinetic energy of the crate
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