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Element X decays to element Y with a half-life of 0.77 s. Initially there is a sample of pure X and after 2.31 s there are 7g of Y. What was the mass of the original sample?
q1. a tennis ball is served at 73.12 ms and was in contact with the racquet for .027 s and starts from rest. the ball
A 26 kg gun is standing on a frictionless surface. The gun fires a .0573 kg bullet with a muzzle velocity of 323 m/s. The positive direction is that of the bullet immediately after the gun was fired. compute the momentum of the gun immedately afte..
A high-speed flywheel in a motor is spinning at 450 rpm when a power failure suddenly occurs. The flywheel has mass 40.0 kg and diameter 72.0 cm. How many revolutions would the wheel have made during this time
A small plane departs from point A heading for an airport 500 km due south at point B, Determine the proper heading for the plane and the time of flight
A 38.0 kg child swings in a swing supported by two chains, each 3.04m long. The tension in each chain at the lowest point is 429N. Find out the child's speeds at the lowest point.
One end of a 33cm long aluminum rod with a diameter of 2.8 is kept at 420C and the other is immersed in the water at 24C
A 3kg model rocket initially at rest experiences an average force of 3950N over a distance of 200 cm. What would tne final altitude be of the rocket
A bumper car with mass m1 = 102 kg is moving to the right with a velocity of v1 = 4.9 m/s. A second bumper car with mass m2 = 90 kg is moving to the left with a velocity of v2 = -3.3 m/s, What is the velocity of the center of mass of the system
An oil droplet with 10.0 excess electrons is observed between two parallel electrodes spaced 12.0 mm apart. What is the radius of the droplet
A gas containing 9 moles is compressed adiabatically from an initial temperature of 288 K to a final temperature of 463 K, what is the work done by the piston
Three negative charges of equal magnitude q are placed along a straight line, Find the electrostatic force on middle (second) charge
A window washer of mass 86 kg stands at a distance d from the midpoint of the scaffold. The tension in the cable nearest the worker is twice the tension in the other. Illustrate what is the tension in the cable nearest the worker? What is the tens..
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