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A 6 m long 50 kg ladder leaning on a frictionless wall can successfully be scaled by a 120 kg man. The coefficient of friction with the floor is 0.5. What is the minimum angle between the ladder and the floor?
How long would it take her to reach the bottom of the hill, assuming she starts from rest and accelerates uniformly, if the elevation change is 324.
Find the difference in decibel levels β1 & β2 of a sound source is related to the ratio of its distances r1 & r2 and find the average power generated by the horn.
Draw a cube and Cartesian axes. All points of the cube lie in the (+,+,+) octant of the coordiante system. One vertex of the cube is at (0,0,0), the point called O.
Bacteria vary somewhat in size, but a diameter of 2.0 nanometers is not unusual. What would be (a) volume (in cubic centimeters) and (b) surface area (in square millimeters) of such a bacterium, assuming that it is spherical.
An object falls off of a pier and into the ocean (sea water) where it displaces a total volume of 3.4 cubic meters of sea water. What is the buoyant force acting on the object in newtons
An ambulance with a siren emitting a whine at 1200 Hz overtakes and passes a cyclist pedaling a bike at 2.44 m/s, How fast is the ambulance moving
A building has two open doors facing the bay. The walls of the building absorb sound well, so multiple reflections can be ignored. Two people are standing a distance L = 150 m from the wall with the open doors, as pictured.
A uniform electric field points midway between the positive x and y axies. Its strength is 100Volts/m. A -50nC charge is placed at the position ( 2m, 3m ) and fixed in place. What are the components of the total electric field at the location (..
An inventor claims to have devised a cyclic engine which exchanges heat with reservoirs at 300 K and 540 K, and which can produce 450 J of work per 1000 J of heat extracted from the hot reservoir. Is his claim feasible.
Calculate the magnitude of the current density in the wire. Find out the work done by the hockey player on the puck. What is the change in kinetic energy of the puck.
A 626g sample of water at 90 degrees is mixed with 441g of water at 30 degrees. What is the final temp of the mixture? Presume not heat is lost to the surroundings.
If you connect these 3 resistors in series across a variable emf source of negligible internal resistance, what is the largest potential difference this emf source can be set to without damaging any of resistors.
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