A block with mass m has a coefficient of kinetic friction Mk with the floor. If the block is obeying Newton's 1st law while being pushed at angle 0 (theta), show that the power needed to push it at velocity v is given by P=Mkv(mg+fsin0).
Hi, I am having trouble doing these problems listed below. Please show me how to solve these problems for future reference. Thank you very much. 1. You are told that the volume of a sphere is given by V = pie d/4, where V is the volume and d is the diameter of the sphere. Is this equation dimensionally correct? (Use SI unit
Hi. Can someone please help me with the following problem? I'll try to draw the circuit (with battery and 4 resistors), but I don't know if all the spacing will come out right. The "///" are resistors. Basically, it's a circuit with a 15-V battery and 4 resistors. First you hit R1, which = 11 ohms. Then there are two paths
Question: An ac generator with a frequency of 1.00 kHz and an rms voltage of 24 V is connected in series with a 2000 ohm resistor and a 0.365 H inductor. (a) What is the power factor for this circuit? (b) What is the average power consumed by this circuit?"
"Three resistors (R, 1/2R, 2R) are connected to a battery. (a) If the resistors are connected in series, which one has the greatest rate of energy dissipation? (b) Repeat part (a), this time assuming that the resistors are connected in parallel."
Scott, riding for the Mercury team, won the 2002 Mt. Rushmore Hill Climb bicycle race with a winning time of 1 hour 50 minutes 20 seconds. The race is 28 miles in length with a total altitude gain of 7000ft. Scott weighs in at 130 lbs and his hill climbing bike weighs 17 lbs. The total weight of his water bottles, shoes, clot
The speed of a 4.0kg object is given by (2t) m/s, where t is in seconds. At what rate is the resultant force on this object doing work at t = 1 second? Answers: a) 48 W b) 40 W c) 56 W d) 16 W A 10kg object is initially at the top of a rise, at point A. It then moves down to point B. Choose point B to be your zero leve
1. A steam turbine at an electric power plant delivers 4500 kW of power to an electrical generator that converts 95 percent of this mechanical energy into electrical energy. What is the current delivered by the generator if it delivers energy at 3600 V? 2. A color television draws about 2.5 A when it is connected to
A block of mass 5kg is lifted 2 meters in 3 seconds. Compute the work done in joules and in ergs.
1. An ant is 3 cm from a magniflying lens with a focal length of 5 cm. The image of the bug is A. real, upright, enlarged, other side of lens B. virtual, upright, enlarged, same side of lens C. virtual, smaller, inverted, same side of lens D. real, upright smaller, other side of lens A 5kW h
The resolving power of a microscope is proportional to the wavelength used. A resolution of approximately 1.0 x 10-11 m (0.01 nm) would be required in order to "see" an atom. (a) If electrons were used (electron microscope), what minimum kinetic energy would be required for the electrons? (b) If phtons were used, what minimum p
A conducting rod of length l moves on two horizontal, frictionless rails, as shown in the attached file 'Figure P31.20'. If a constant force of 1.00 N moves the bar at 2.00 m/s through a magnetic field B that is directed into the page, (a) What is the current through the resistor R? (b) What is the rate at which energy is d
I only need the last five parts explained to me. See attached PDF file for the question ! Homework 5-1 Due date: Mon 22 Mar 2004 09:00:00 AM MST 18 point(s) Pulling Out Tree Stump You are in a truck trying to pull out a tree stump. The mass of the tree stump m is 170.0 kg. You have attached the winch at the f
1. A 1500kg automobile starts from rest on a horizontal road and gains speed of 72km/h in 30 s. a) What is the average power required of the car at the end of the 30 s? b) What is the average power required of the car during the 30 s interval? c) What is the instantaneous power at the end of the 30 s interval, assuming t
A 60.0 ohm resistor is connected in parallel with a 115.0 ohm resistor. This parallel group is connected in series with a 15.0hm resistor. The total combination is connected across a 15.0-V battery. Find the current and power in the 115 ohm resistor.
I have been struggling with this problem for two days. I tried to apply the basic kinematic equations to the problem but couldn't figure it out
You buy a 60W lightbulb in Europe, where electricity is delivered to homes at 240V. If you use the lightbulb at home in the United States, how bright will it be relative to 60W 110V bulbs? Calculate how much power it will consume.
What happens to the power used by an electric appliance if the voltage across this appliance is decreased to half of the original value?
A person is making homemade ice cream. She exerts a force of magnitude 22 N on the free end of the crank handle, and this end moves in a circular path of radius 0.28 m. The force is always applied parallel to the motion of the handle. If the handle is turned once every 1.3s, What is the average power being expended?
A person is making homemade ice cream. She exerts a force of magnitude 22 N on the free end of the crank handle, and this end moves in a circular path of radius 0.28 m. The force is always applied parallel to the motion of the handle. If the handle is turned once every 1.3s, What is the average power being expended?
A person is making homemade ice cream. She exerts a force of magnitude 22 N on the free end of the crank handle, and this end moves in a circular path of radius 0.28 m. The force is always applied parallel to the motion of the handle. If the handle is turned once every 1.3 s, what is the average power being expended?
See attached file. Orbit of particle moving in a central field: Show that the force law is inverse-fifth power.
Question: A power line is 3.5m off the ground and is carrying 75 amps. A man standing under the power line is holding a compass 1.25m off the ground. 1) How large is the magnetic field produced on the compass by the power line? 2) If the power line runs east and west, how does its magnetic field affect the direction in whi
A large yacht has a mass of 305 tonnes. The yacht sinks and is lying on the sea bed at a depth of 40m. It is estimated that the volume of teh yacht is such that it displaces 0.8m3 of water when it is totally submerged under water. A salvage team decides to raise the yacht to the surface by fixing large bags to the yacht and
An electric eel can generate a 400-Volt, 0.5-A shock for stunning its prey. What is the eel's power output?
The explosion of the firecracker in the air at a height of 40m produces a 100 db sound level at the ground below. If the threshold of hearing is 10-12Wm-2, what is the instantaneous total radiated power, assuming that it radiates as a point source?
1. Birds resting on high-voltage power lines are a common sight. The copper wire on which a bird stands is 2.2cm in diameter and carries a current of 50A. If the bird's feet are 4.0cm apart, calculate the potential difference across its body. 2. An x-ray tube used for cancer therapy operates at 4.0MV, with a beam current of
An electricity generating station has a rated output of 300 megawatts. Given that the station heat rate is 12 000kJ/kW-h, and the coal used has a heat value of 23 000kJ/kg, find the minimum possible belt-drive power required for the bunker coal conveyor in order to keep the boiler supplied when the station is on full load. The
A 7.5 x 10^4 W motor that is 75% efficient exerts an average force of 3.5 x 10^3 N to move a boat at a constant speed. How fast is the boat moving? NOTE: efficiency = output/input. Motors are rated as to their input. 7.5 x 10^4 is the power input.
A heating element draws 7.50 A on a 120V line. At the rate of 8.00 cents per kW h what is the cost of operation for 5.00 h?