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1/ A 55.0-kg mass starts at the top of a 15.2-m tall ramp; the ramp is frictionless and makes an angle of 32 deg with respect to the horizontal.
a. What is the speed of the mass at the bottom of the ramp?(Use energy consideration to solve the problem)
b. Now assume there's friction and that the coefficient of kinetic friction between the box and the ramp is 0.12. Draw a free body diagram of the situation.
c. Calculate the work done by friction as the box slides down the entire length of the ramp.
2/ The planet Neptune orbits our Sun at an average distance of 4.50 * 10^9 km.It's mass is 1.02 8 10^26 kg. The Sun's mass is 1.99 * 10^30 kg.
a. What is the strength of the gravitational attraction between Neptune and the Sun?
b. How long does it take for Neptune to orbit the Sun?
c. The radius od neptune averages 24,600 km. What is the strength of the gravitational field at the "surface"of Neptune?
Two wires, each 28.15 cm long, are connected to two separate 9.00 V batteries as shown in the figure. The resistance of the first wire is 5.00 Ω, and that of other wire is unknown (R). If the separation between the wires is 4.55 mm, what value of R w..
What must the charge (sign and magnitude) of a particle of mass 1.44g be for it to remain stationary when placed in a downward directed electric field of magnitude 660 N/C.
A 0.50-kg object is attached to an ideal massless spring of spring constant 20 N/m along a horizontal, frictionless surface. The object oscillates in simple harmonic motion and has a speed of 1.7 m/s at the equilibrium position.
A sound wave traveling at 341m/s is emitted by foghorn of a tugboat. An echo is heard 3.30s later.
The distance between the electron and proton in a hydrogen atom is 5.3 x10-11 m. Find the speed of the electron as it orbits the proton
A 87 arrow is fired from a bow whose string exerts an average force of 120N on the arrow over a distance of 78cm. Evaluate the speed of the arrow as it leaves the bow?
Two converging lenses are placed 88.0 cm apart. An object is placed 1.100 m to the left of the first lens, What is the focal length of the second lens
A hotel elevator ascends 200 m with maximum speed of 5m/s . Its acceleration and deceleration both have a magnitude of 1.0 m/s^2 . a.)How far does the elevator move while accelerating to full speed from rest?
A defibrillator is used during a heart attack to restore the heart to its normal beating pattern. A defibrillator passes 18 A of current through the torso of a person in 2.1 ms, How much charge moves during this time
A thin double convex lens is to focus the image of an object onto a screen so that the image is life-sized. What is the total distance L between object and image
A 12 volt battery powers a circuit that consists of a ten ohm resistor in series with a ten ohm and a 15 ohm that are in parallel. How much current flows through the 15 ohm resistor
A Carnot engine is operated between a hot and a cold reservoir. find the temperature of the cold reservoir
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