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A radioactive material produces 1200 decays per minute at one time, and 6 h later produces 300 decays per minute. What is its half-life?
A rock climber throws a small first aid kit to another climber who is higher up the mountain. What is the vertical height between the two climbers
a spaceship enters the solar system moving toward the sun at a constant speed relative to the sun. by its own clock the
A 58.0 m length of insulated copper wire is wound to form a solenoid of radius 1.8 cm. The copper wire has a radius of 0.51 mm. What is the self-inductance of the solenoid
A ball of mass 0.40 kg moves horizontally at a velocity of 25.0 m/s. What was the average force exerted on the ball by the wall
the outer wall of a building is constructed from concrete blocks. if the wall is 5.0 m long at 20 degrees celcius, How much shorter is it on a cold day
A radiometer has two square vanes (each measuring 1.0 cm by 1.0 cm), attached to a light horizontal cross arm, find the electromagnetic power absorbed by the blackened vane
question1a space station is in the shape of a hollow ring 450 in diameter. at how many revolutions per minute must it
Three resistors having resistances of 1.50{\rm \Omega} , 2.30{\rm \Omega}, and 4.70{\rm \Omega} are connected in parallel to a 29.0{\rm V}battery that has negligible internal resistance
A 1150 kg car rolling on a horizontalsurface has speed v = 50 km/h, What is the spring stiffness constant of the spring
Some asteroid fragments are large enough to not completely burn up in the atmosphere and they end up on the surface of the Earth. What is the chief cause of radioactivity
What is the lower radiated from a nichrome wire 1.0 m long and 1.5 mm in diameter at a temperature of 900? C? The emissivity of nichrome at this temperature is 0,092.
A gasoline engine absorbs 2,600 J of heat and performs 1,000 J of mechanical work in each cycle. Find the total of heat expelled in each cycle.
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