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In the diagram shown, Robert is pushing a 65.5kg wooden box up a ramp angled at 37o to the horizontal. If there is no friction involved, what force does Robert need to apply to keep the box moving at a constant speed? Assume Robert is pushing with a force directed parallel to the surface of the ramp.
What is the Normal force acting on the box from the ramp?
The next box Robert pushes up the ramp has a coefficient of kinetic friction between the box and the ramp of 0.11. The coefficient of static friction between the box and the ramp is 0.19. What force does Robert need to use to start the box moving up the ramp?
After he gets the box moving, what force does Robert need to use to accelerate the box up the ramp at 0.25m/s2?
An excited state in a certain atom has an average lifetime of 5.2 × 10-10 s. What is the uncertainty in the energy of that state?
What is the work W done by the gas and what is the change of the internal energy U of the gas during the process?
a plank of mass m and length L is attached to a wall at one end, What is the magnitude of the force f exerted on the plank by the wall in terms of D, m, L
A man throws a ball such that it strikes a wall of a building at the max height of its trajectory. If it takes 1.15 seconds to travel from man to the building, determine the velocity at which it was thrown, the angle, and the height of the building.
A line of charge lies along the x-axis extending from x=0m to x=3m. The line charge densit is a function of the distance from the coordinate beginning x and is given by λ=2x [nC/m]. Find the total charge of the line charge Q.
Two identical small insulated conducting spheres, whose centers are 18.9 cm apart, carry charges Q1=-100microC and Q2=-200microC, respectively. The spheres are kept insulated, but are then brought into mutual contact and then returned to their ori..
Estimate the wavelength of the light.
The receiver "mixes" the reflected wave with a small amount of the emitted wave and measures a beat frequency of 0.30Af-105 Hz. How fast is the ball moving?
Two resistors, of R1 = 2.93 ? and R2 = 6.69 ?, are connected in series to a battery with an EMF of 24.0 V, Find the current I1 through the first resistor
You have a questionnaire to measure interest in majoring in statistics, and you have 50 first-year students to work with. Outline the design of an experiment to decide which brochure works better
A thread is wrapped around a pulley of moment of inertia I and radius R. The free end of the pulley is connected to a mass M which you release from rest. What is tension in the thread during this process? You may want to check what would happen..
A flat go-kart track consists of two straight ways 100 m long with semicircular ends which have a radius of 25.0 m. Determine the magnitude of the total acceleration of the go-kart at the beginning and end of the curve
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