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A 980 Kg car traveling at 20 m/s rounds a curve of radius 40 m. What is the friction force that must act on the car to keep it in its circular path?
What maximum magnitude can it have if the ball is to strike the floor inside the back line on the other side of the net?
Pu-241 is produced from neutron absorption by Pu-240 (which is produced by neutron absorption by Pu-239). Calculate the fractional in-growth of Am
An artillery shell is fired with an initial velocity of 300 m/s at 55° above the horizontal. It explodes on a mountainside 42 seconds after firing.
The following percentages of three pesticides added to a soil remained after increasing times.
One end of a spring is attached to a solid wall while the other end just reaches to the edge of a horizontal, frictionless tabletop.
An object with an initial velocity 8m/s moves along a straight line with constant acceleration and travels 640m in 40s.
What would the diameter of such a disk need to be if it is to store an amount of kinetic energy of E when spinning at an angular velocity of omega.
If you body is emitting infrared radiation of wavelength 9.4 x 10^(-6)m, what is the energy of the released photons?
Merry-Go-Round. Two identical twins, Jena and Jackie, are playing one December on a large merry-go-round a disk mounted parallel to the ground.
Two inertial frames O and O' are in standard configuration. Write down the two equations relating spacetime intervals Delta x' and Delta t' in O'
Assuming no energy escapes, find the approximate temperature rise of 1kg of 235U over 1year from decay.
Carbon-14 datin of ancient objects requires that material to be organic in order to assay its age. You hear someone sat that a dinosaur bone ws carbon dated
The muon is a subatomic particle with the same charge as an electron but with a mass that is 207 times greater. m_u = 207m_e.
A stone is thrown vertically downward with a speed of 6m/s from a cliff. How far down will the stone be from the cliff after 3.0 s?
A stuntman is being pulled along a rough road at a constant velocity, by a cable attached to a moving truck.
Prove that the De Broglie wavelength associated with a particle having kinetic energy K which is not negligible compared to its rest energy m0 c^2 is given by
The velocity of a 1.9 kg block sliding down a frictionless inclined plane is found to be 1.15 m/s. 1.40 s later, it has a velocity of 5.35 m/s.
A volleyball is spiked so that it has an initial velocity of 15 m/s directed downward at an angle of 55 degrees below the horizontal.
How fast does a proton have to be moving is order to have the same de Broglie wavelength as an electron that is moving at 3.75x10^6 m/s? Units are m/s.
For each of the first 7 seconds of freefall, calcucate the distance that the hammer fall, and its velocity at that particular moment.
Which material would have the strongest compressive strength?
Is the same result true if they land at different times (with one piece still landing 100m beyond the target)
Name the three kinds of strength used to characterize materials AND give an example of a material that are strong in each of these modes.
On 15 March 2012, researchers at the National Ignition Facility fired all 192 laser beams at once to deliver 1.875 MJ of energy in 23 billionths