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A small electric car overcomes a 250 N friction force when traveling 30 km/h. The electric motor is powered by ten 9 V batteries connected in series and is coupled directly to the wheels whose diameters are 50 cm. The 300 armature coils are rectangular, 10 cm by 15 cm, and rotate in a 0.66 T magnetic field.
(a) How much current does the motor draw to produce the required torque?
(b) What is the back emf?
(c) How much power is dissipated in the coils?
(d) What percent of the input power is used to drive the car?
A 61-kg and a 97-kg skydiver jump from an airplane at an altitude of 6100 m, both falling headfirst. Calculate their terminal velocities
a 1000 N crate is being pushed across a level floor at a constant speed Vi=1.75 m/sec by a force of F=300N at an angle of theta=20 Degrees below horizontal. what is the final velocity of the crate
Projects A and B are mutually exclusive. Project A costs $10,000 and is expected to generate cash inflows of $4,000 for 4 years. Project B costs $10,000 and is expected to generate a single cash flow in year 4 of $20,000.
A glider of mass 0.155kg is moving to the right on a frictionless, horizontal air track with a speed of 0.760m/s. Find the magnitude of the final velocity of the 0.155kg glider
The Research Paper will be a comprehensive research review of the significant principles of management communications used to successfully achieve organizational objectives
US firm X wants yens. It can borrow yens at 5% and can borrow dollars at 10%. Japanese firm Y wants dollars. It can borrow dollars at 12% and can borrow yens at 6%. You are the swap bank.
The numerical value of the faraday constant is given as 96500 this value represents the number of carried by
Compare zero-, one, two-, and three- address machines by writing programs to compute.
The "Zebra" cell was invented in 1985 in South Africa as part of the "ZEolite Battery Research Africa" project, and is used in all-electric municipal buses and other vehicles.
CO 5) What should be the coefficient of hydrogen, H2, in the following equation in order to make it balanced? 2 Al + 3 H2SO4 ---> Al2(SO4)3 + ? H2
A parallel plate capacitor has square plates with sides of length 20 cm. The distance between the plates is 1 mm. What is the electric field between the plates
If the swimmer starts at rest, slides without friction, and descends through a vertical height of 2.41 m, what is her speed at the bottom of the slide
What is the wavelength of the waves emitted by source? What is the difference in frequency between directly radiated waves and the waves reflected from a whale travelling straight toward the ship at 4.99? Suppose that the ship is at rest in the water..
A block of the same weight as the meter stick is suspended from the stick, as shown, at a distance x from the wall. What is the minimum value of x for that the stick will remain in equilibrium.
Six artificial satellites complete one circular orbit around a space station in the same amount of time. Each satellite has mass and radius of orbit. The satellites fire rockets that provide force needed to keep a circular orbit around the space stat..
What is the propotion of the mass of these excess electrons to the mass of the penny.
What is the wavelength of the waves produced on the wire.
When a bow and arrow are cocked, a force is applied to the string to pull it back. Is the energy of the system increased? Explain
compute approx the rate of heat transfer on to the window surface if the inside surface is maintained at 5 Deg C?
A rotating wheel requires 3.09-s to rotate through 37.0 revolutions. calculate the constant angular acceleration of the wheel
Starting 4.0m from a department store mirror, How far is Suzanne from her image in the mirror after 1.0s
A proton moving at 6.80 106 m/s through a magnetic field of magnitude 1.80 T experiences a magnetic force of magnitude 7.00 10-13 N. What is the angle between the proton's velocity and the field
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