What is Ohm's law? Why Einstein didn't propose Laws of motion?

A stationary particle of charge q = 2.0

A projectile (from the ground) is thrown at a vertical wall that has a height of 15 [m] and is 150 [m] away. If the initial velocity of the projectile is Vo = 50 [m / s], find the shooting angles needed for the projectile to pass 10 [m] above the top of the wall. Calculate the maximum height reached by the projectile in each case.

A physics major is working to pay his college tuition by performing in a traveling carnival. He rides a motorcycle inside a hollow transparent plastic sphere. After gaining sufficient speed, he travels in a vertical circle with a radius of 11.0 m . The physics major has a mass of 74.0 kg , and his motorcycle has a mass of 40.0 kg

Part A.) What minimum speed must he have at the top of the circle if the tires of the motorcycle are not to lose contact with the sphere? (???m/s)

Part B.) At the bottom of the circle his speed is twice the value calculated in part A. What is the magnitude of the normal force exerted on the motorcycle by the sphere at this point? (???N)

An ideal heat engine takes in heat from a reservoir at 330 °C and has an efficiency of 31%. If the exhaust temperature does not vary and the efficiency is increased to 42%, what would be the increase in the temperature of the hot reservoir?

Sketch a simple pendulum displaced at a small angle. Draw and label all forces acting on the mass. Resolve the component of gravity in the direction of motion. Use Newton's 2nd law to write the dynamic equation that predicts the acceleration of the mass.

Why must the angle be kept small? (Here, it's asking about the experiment with a pendulum that I just did and why the angle had to be kept smaller than 10 degrees)

In 2004 astronomers reported the discovery of a large Jupiter-sized planet orbiting very close to the star HD 179949 (hence the term "hot Jupiter"). The orbit was just 19 the distance of Mercury from our sun, and it takes the planet only 3.09 days to make one orbit (assumed to be circular).

What is the mass of the star in kilograms?

(b) as a multiple of our sun's mass.

(c) How fast (in km/s) is this planet moving?

A 5.00 kg block is moving at 3.00 m/s along a frictionless table and collides with a 2.00 kg block that is initially at rest. The two blocks stick together and then slide up a 20.0 ◦ frictionless inclined plane. What is the maximum distance the two blocks slide up the incline?

This is an old classic which I don't think ever got a clear answer. The Gribov-Froissart projection that gives the relativistic version of Regge trajectories treats even angular momentum differently from odd angular momentum. The trajectory functions in general are separate for even and odd angular momentum.

But in QCD, the odd trajectories interpolate the even trajectories in every case--- the two trajectories are degenerate. Is there a way of understanding why the even-odd trajectories are degenerate? Is is a symmetry argument? Can you find a natural system where they are not degenerate?

A quick google search revealed this reference, which doesn't answer the question, but gives an experimental signature for the degeneracy: http://www.slac.stanford.edu/cgi-wrap/getdoc/slac-pub-0576.pdf , There is probably excellent data by now on this.

The parachute on a race car of weight 8150 N opens at the end of a quarter mile run when the car is traveling at 33.6 m/s. What total retarding force must be supplied by the parachute to stop the car in a distance of 1090 m?

A 2.00 m long horizontal uniform beam is supported by a wire as shown in the figure. The wire makes an angle of 20.0 degrees with the beam. A 40.0 kg signboard is attached to the beam 1.40 m from the wall . What is the tension in the string if the beam has 20.0 kg mass?

A merry-go-round is spinning around a frictionless axle at its center with a person standing at the edge. The person then begins to walk toward the center. Will the merry-go-round spin faster or slower as a result? Explain your answer.

How does physics translate to electrical engineering?

An insulated Thermos contains 123 g of water at 83.0 ˚C. You put in a 7.92 g ice cube at 0.00 ˚C to form a system of ice + original water. The specific heat of liquid water is 4190 J/kg•K; and the heat of fusion of water is 333 kJ/kg. What is the net entropy change of the system from then until the system reaches the final (equilibrium) temperature?