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A length of wire has a resistance of 800 omega. The wire is cut into N identical pieces which are then connected in parallel. The resistance of the parallel arrangement is 16.32 omega. Find N.
Megan's mass is 27 kg. She climbs the 4.8 m ladder of a slide and reaches a velocity of 3.6 m/s at the bottom of the slide. How much work was done by friction on Megan?
On the Wheel of Fortune game show, a solid wheel (of radius 7 m and mass 10 kg) is given an initial counterclockwise angular velocity of +1.26 rad/s. It then comes to rest after rotating through 3/
A single household circuit operates at 120 V and is protected by a 20 A circuit breaker. How many 30 W lamps can be operated simultaneously without tripping the circuit breaker?
A banked circular highway curve is designed for traffic moving at 66 km/h. The radius of the curve is 207 m. Traffic is moving along the highway at 49 km/h on a rainy day. What is the minimum coeff
A ranger in a national park is driving at 54 km/h when a deer jumps onto the road 61 m ahead of the vehicle. After a reaction time of t s, the ranger applies the brakes to produce an acceleration o
A particular organ pipe can resonate at 231 Hz, 385 Hz, and 539 Hz, but not at any other frequencies in between. Is it an open or a closed pipe?
A 0.507-kg block is attached to a horizontal spring that is at its equilibrium length, and whose force constant is 15.1 N/m. The block rests on a frictionless surface. A 0.0500 kg wad of putty is t
The mass of the resistor is 57. How much does the temperature of the carbon increase if the wire is pulled for 10 ? The specific heat of carbon is 710.
Find average energy of system as function of temperature and entropy of system.
A hunter wishes to cross a river that is 1.2 km wide and that flows with a speed of 3.0 km/h. The hunter uses a small powerboat that moves at a maximum speed of 11.2 km/h with respect to the water.
A 12.1 g bullet is stopped in a 4.6 kg block of wood. The speed of the bullet-plus-wood combination immediately after the collision is 0.348 m/s. What was the original speed of the bullet?
The change in length of each rod is the same. If the initial length of the lead rod is 0.090 m, what is the initial length of the quartz rod?
Light of wavelength 560 nm illuminates a single slit placed 60 cm from a screen. The separation between the first and third minima in the diffraction pattern is 2.8 mm. What is the slit width?
The energy of a particle in the laboratory is 8.00 times its rest energy. The particle is unstable and decays. In its rest frame the average lifetime of the particle is 10^-10 seconds
A 10.0 g bullet is fired horizontally into a 101 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 141 N/m. The bullet b
A magnetic field B parallel to the z-axis is given by 0.810*t*y^2 , where B is in tesla, y in meters, and t in seconds. What is the size of the induced current in the loop at = 0.540 ?
In the direction of his motion, at 3 m/s relative to the speed of bicycle just before the throw. What is the momentum of the system immediately after the pack is thrown?
You decide to find the coefficient of static friction between a paper cup and an archaic paper textbook. Armed with a metric ruler, you place the cup on the edge of the book, and raise the edge of
What is the equation to find the magnitude of tangential acceleration?
There is an 80kg beam attached to a hinge on a wall and supported by a cord. The angle between the cord and the beam is 25 degrees. The beam is 4.5m long., and the cord is attached to the beam a me
Assuming that the torque is unchanged, but the mass of the wheel is doubled and its radius is halved. How will this affect the angle through which it rotates before coming to rest?
Eleven moles of an ideal monatomic gas expand isothermally at a temperature of 41°C. If the volume of the gas quadruples during this process, what is the heat flow into the gas? in kJ
Find the net electric field (magnitude and direction given as a plus or minus sign) at (a) x = 0 cm and (b) x = +6.00 cm.
A device used in radiation therapy for cancer contains 7.40×10-1 g of cobalt 2760Co (59.9333819 u). The half-life of 2760Co is 2.72 yr. Determine the activity of the radioactive material.