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A 100-kg streetlight is supported equally by two ropes. One rope pulls up and to the right, 40° above the horizontal; the other rope pulls up and to the left, 40° above the horizontal. What is the tension in each rope?
Charges of -11.5 nC and -22.1 nC are separated by 0.733 m. What is the potential midway between the two charges?
A hiker walks 3.50 km at an angle of 45.0 degrees north of west. After that the hiker walks 1.5 km south. What is the magnitude and direction of hiker's totally displacement.
A hydrogen atom is in its ground state when its electron absorbs a 48-keV photon. What's the energy of the resulting free electron
some types of glass have a range of indices of refraction of about 1.4 to 1.7. What is the range of the polarizing angle
The angular position of a pendulum is represented by the equation ? = 0.0310 cos ?t, Determine the period and length of the pendulum
A cart mass M moves on a frictionless track. It is attached to a string, which goes over a pulley wheel & has a mass m hanging from it. At t=0 s the cart starts from rest & accelerates. Find the tension in the sting & acceleration of the cart.
small ferryboat is 4.00 m wide and 6.00 m long. When a loaded truck pulls onto it, What is the weight of the truck
A drug prepared for a patient is tagged with 9943Tc, which has a half-life of 6.05 h. What is the decay constant of this isotope
A gob of clay, mass 217 g, falls from rest a distance 50 cm before striking and sticking to the edge of a wheel free to rotate about a horizontal axis through its center.
Calculate the number of electrons in a steel iron pinhead. The pinhead may be assumed to be spherical with a diameter 2mm
The Eskimo pushes the same 50.0-kg sled over level ground with a force of 2.25 102 N exerted horizontally, evaluate the coefficient of kinetic friction
An ambulance moving at 42 m/s sounds its siren whose frequency is 450 Hz. a car is moving in the same direction as the ambulance at 25 m/s. what frequency does a person in the car hear as the car approaches the ambulance? After the ambulance passe..
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