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The number of radioactive nuclei present at the start of an experiment is 4.10 10^15. The number present 25 days later is 7.84 1014. Estimate the half-life of the nuclei?
(in days)
A 6110 kg space probe moving nose-first toward Jupiter at 150 m/s relative to the Sun fires its rocket engine, What is the final velocity of the probe
A 3700-lb automobile (m = 1600 kg) starts from rest on a level road and gains a speed of 45 mi/h (= 72 km/h) in 33 s. What is the average net power delivered to the car during the 33-s interval
Two children hang by their hands from the same tree branch. The branch is straight, and grows out from the tree trunk at an angle of 27.0° above the horizontal. What is the magnitude of the net torque exerted on the branch by the children
What makes up the Total Energy of a System? Mathematically what similarities do Gravitational Potential Energy and Elastic Potential Energy have with each other?
A spring attached to the ceiling of an elevator is 10 cm long when nothing is hanging from it. It is 12 cm long when a certain mass is hanging from it and the elevator is at rest. If the elevator moves upwards at an increasing speed of 4m/s^2, how lo..
A 2.50 g lead bullet traveling at 560 m/s strikes a target, converting its kinetic energy into thermal energy. It's initial temperature is 40.0°C. Find the heat required to melt the bullet
A batter hits a 0.14kg baseball that was approaching him at 30.0 m/s and, accordingly, the ball leaves the bat at 40.0 m/s in the direction of the pitcher. The ball remains in contact with the bat for 2ms. What is the average force exerted by bat.
Two trains on separate tracks move toward each other. Train 1 has a speed of 125 km/h; train 2 a speed of 84.0 km/h. What is the frequency heard by the engineer on train 1
An object with a height of 5cm is placed in front of a concave mirror that has a focal length of 12cm. where should the object be placed
Calculate the electric field at the center of a square 52.5 cm on a side if one corner is occuppied by a +45.0 uC charge and the other three are occupied by -27.0 uC charge
An elevator (mass 5000 ) is to be designed so that the maximum acceleration is 6.20×10?2. What is the maximum force the motor should exert on the supporting cable
An airtight box having a lid with an area of 14.0in2 ( 90.32cm2 ) is partially evacuated. what is the air pressure in the box
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