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Q. The resolving power of a microscope depends on the wavelength used. If you wanted to "see" an atom, a wavelength of approximately 1 × 10-11 m would be required. (a) If electrons are used (in an electron microscope), what least amount kinetic energy is required for the electrons? (b) What If? If photons are used, what minimum photon energy is needed to get the required resolution?
For a science fair competition, a group of high school students build a kicker-machine that can launch a golf ball from the origin with a velocity of 37.5 m/s and initial angle of 38.4° with respect to the horizontal.
A small immersion heater is rated at 352 W. Estimate how long it will take to heat a cup of soup (suppose this is 250 mL of water) from 20°C to 50°C.
A 77 person stands on the uniform ladder 4.0 long, that weighs 100. The floor is rough; hence, it exerts both a normal force, and a frictional force, on the ladder. The wall, on the other hand, is frictionless; it exerts only the normal force.
A 44.20 cm diameter disk rotates with a constant angular acceleration of 2.84 rad/s2. It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk makes an angle of 57.3° with the positive x-axis at t..
When his mom asked him why he is smoking he told her, "Don't worry mom, it is not that bad after all." Which term is being described in Trent's situation.
calculate the work done on a charge Q. If an automobile rounds this curve at 30 {rm m/s}, what is the least coefficient of static friction between tires and road needed to prevent skidding.
A swimmer heads directly across a river, swimming at 1.60 m/s relative to the water. She arrives at a point 58.0 m downstream from the point directly across river, 63 m wide. What is the speed of the river current.
What is the amplitude of the subsequent oscillations. A catcher "gives" with a baseball when catching it. If the baseball exerts a force of 519 N on the glove, so that the glove is displaced 10.0 cm, how much work is done by the ball.
A 50.0 g silver spoon at 20.0 C is placed in a cup of coffee at 90.0 C. How much heat does the spoon absorb from the coffee reach a temperature of 89 C.
A pair of in-phase stereo speakers is placed side by side, 2m apart. You stand directly in front of one of the speakers, 5m from the speaker. What do you hear.
What is the tension in the string.At one time, television sets used "rabbit-ears" antennas. Such an antenna consists of a pair of metal rods.
A car traveling at 21 runs out of gas while traveling up a 21 slope.How far up the hill will it coast before starting to roll back down.
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