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Question: A 1570N crate is pushed to the right across a level floor by a constant force of 400N directed at 30 degrees below horizontal. There is a friction between the crate and the floor.
(a) Draw. a free- body diagram of the crate indicating all forces and direction.
(b) If the crate is in equilibrium, how large is the force of kinetic friction acting on the crate?
(c) what is the coefficient of kinetic friction?
A pot containing 1.06 liter of water, initially at 22°C, is placed on a 1091 W electric heating element. How much heat is necessary to boil all the water away
One way to measure on another planet or moon by remote sensing is to measure how long it takes an object to fall a given distance. A lander vehicle on a distant planet records the fact that it takes 3.17 for a ball to fall freely 11.26.
One mass, m1 = 0.215 kilogram, of an ideal at wood machine rests on the floor 1.1 meter below the other mass, m2 =0.255 kilogram. Estimate how high will mass m1 ascend from the floor
A woman walks for 4 min directly north with a average velocity of 6 km/h; then she walks eastward at 4 km/h for 10 min. What is the magnitude of her average velocity
A generator has a square coil consisting of 580 turns. The coil rotates at 51 rad/s in a 0.28 T magnetic field. What is the length of one side of the coil
A projectile is shot from the edge of a cliff 125 m above the ground level with an initial speed of 65.0 m/s at an angle of 37 degree above th horizontal. find the position vector of the projectile when it reaches it maximum height above the top of..
a carnot engine whose cold reservior temperature is 262.09 in celsius has a thermal efficiency of 15.88. by how much
A cord of length 1.4 meter is fixed at both ends. Its mass per unit length is 1.0 g/m and the tension is 11 N. Evaluate the frequency of the fundamental oscillation
The Hamiltonian of a particle isH=Aa+a+B(a+a+), What are the energy eigenvalues of the particle
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
If we imagine an electron as orbiting the proton, with the orbit of radius 5 x 10 ^-11 m, what is the total energy of the atom
A 23.0 g block of copper whose temperature is 447 K is placed in an insulating box with a 92.4 g block of lead whose temperature is 132 K. find the equilibrium temperature of the two-block system
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