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A man wants to push a package of shingles of total mass 36 kg up a roof being built at an angle of 35o to the horizontal. The coefficient of kinetic friction between the package and the roofing paper already in place is 0.30.
(a) How much force does the man have to exert on the package directly along the slope of the roof to cause the package to accelerate at 0.1 m/s2?
(b) What is the minimum coefficient of static friction needed so that the package will not slide when it is left at rest on the roof?
A 3.5 g ping-pong ball rubbed against a wool jacket acquires a net positive charge of 1.5muC. Estimate the fraction of the ball's electrons that have been removed
A resistor is made out of a long wire having a length L. Each end of the wire is attached to a terminal of a battery having a constant voltage Vo. A current I flows during the wire. If the wire were cut in half, making two wires of length L/2, and bo..
question1in an assured region of space there is uniform electric field e and uniform magnetic field b both directed
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Suppose your waffle iron is rated at 0.85 kW when connected to a 2.10 102 V source. What current does the waffle iron carry
Ignoring end effects, what is the smallest time interval required for the electron to pass through the solenoid without striking the coils?
A child pulls an imaginary friend in a wagon at constant speed for 10m with a force of 16N. how much work does the child do
It takes 2.43ms for the current in an LR circuit to increase from zero to 0.74 its maximum value. Determine the time constant of the circuit
three point charges 1 mc 1 mc and -1mc are placed in three vertices of a square which has 2 m long sides. the picture
A 22 gram bullet strikes a 0.85 kilogram block attached to a fixed horizontal spring whose spring constant is 6.8x103 N/m and sets it into vibration with amplitude of 25 centimeter. Find the speed of the bullet before impact
Ammonia The ammonia molecule NH3 has apermanent electric dipole moment equal to 1.47 D, where 1 D = 1debye unit = 3.34 multiplied by 10-30 C·m. Calculate the electric potential due to an ammonia molecule at a point56.0 nm away along the axis of the d..
A 120 Volt rms voltage at 60 Hertz is applied across an inductor, capacitor and a 100 Ω resistor in series. determine the rms value of the current in this circuit
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