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Sr-90 may be produced from an atomic bomb explosion. The half-life of Sr-90 is 28.8 years. What fraction of the Sr-90 originally produced by the first atomic bomb in July 1945 still remains as of July 2012?
a) 0.102
b) 0.209
c) 0.443
A 0.54-kg particle has a speed of 2.0 m/s at point A and kinetic energy of 7.5 J at point B. What is its speed at point b
A converging lens of focal length 7.99 cm is 19.7 cm to the left of a diverging lens of focal length -6.02 cm, Calculate the magnification of the coin's final image
A circular loop of radius 24.9 cm is located in the plane of the paper inside a homogeneous magnetic field of 0.280 T pointing into the paper. Calculate the current induced in the loop during that time
An infinite line of positive charge lies along the y axis, with charge density ? = 1.20 ?C/m. find the magnitude of the net force exerted on the dipole
A heat engine produces 12,000 W of power and operates at an efficiency of 21%. What is the heat input to the engine
Calculate the linear acceleration of a car, the 0.340 m radius tires of which have an angular acceleration of 7.0 rad/s2. Assume no slippage
What is the net electric force acting on particle.
The range of human hearing extends from approximately 20 Hz to 20,000 Hz. Find the wavelengths of these extremes at a temperature of 8°C. 20 Hz
A stationary destroyer is equipped with sonar that sends out pulses of sound at 35.000 MHz. If the speed of sound in seawater is 1.57 km/s, find the depth of the submarine
If an electric wire is allowed to produce a magnetic field no larger than that of the Earth .45E-4 T at a distance of 27 cm
A star ship is circling a distant planet of radius. The astronauts determine that the acceleration because of gravity at their altitude is half the value at the planet's surface. How far above the surface are they orbiting? Your reply would be a m..
A rope applies a horizontal force of 180N to pull a crate a distance of 2m across the floor A frictional force of 60N opposes this motion.
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