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Assume that the convective heat transfer coefficient between ambient air outside and the outide wall(with insulation) is 750 W/m^2 K.
A 13-kg ball moving at 24 m/s collides elastically and head-on with a second 5-kg ball moving in the opposite direction with -15 m/s. What is the speed of the first ball after the collision? Give yo
A racetrack has the shape of an inverted cone, as the drawing shows. On this surface the cars race in circles that are parallel to the ground, and the surface is at an angle 31°. For a speed of
The block is then pulled so that the spring stretches to a total length of 0.15 m. The block is released at time t= 0 s and undergoes simple harmonic motion. What is the speed of the block each time
A 2.0kg object is attached to a spring (k= 60.0N/m) that hangs vertically from the ceiling.The object is displaced 0.050m vertically. When the object is released, the system undergoes simple harmoni
During a process 10J o work are performed on a system, while the system itself gives off 5J of heat. The internal energy of the system
Each plate of a parallel-plate capacitor is a square of side 4.75 cm and the plates are separated by 0.415 mm. The capacitor is charged and stores 7.65 nJ of energy. Find the electric field strength
The magnetic flux that passes through one turn of a12-turn coil of wire changes to 3.5Wb from 12.0 Wb in a time of0.100s. The average induced current in the coil is115A. What is the resistance of t
A pingpong ball weighs 0.025 N. The ball is placed inside a cup that sits on top of a vertical spring.the spring is compressed 0.075m and released, the maximum height above the compressed position t
The yellow light from a helium discharge tube has a wavelength of 587.5nm. When this light illuminates a certain diffraction grating it produces a first-order principal maximum at an angle of 1.250.
The fundamental resonance on a string of 60 cm length fixed at both ends is 440 Hz. What is the speed of a wave traveling on this string?
a) Ocean waves move toward the beach with a speed of 8.90 m/s and a crest-to-crest separatiion of 15.0 m. You are in a small boat anchored off shore. At what frequency do the wave crests reach your
What is the magnitude and direction of angular momentum of the teacher plus the turn table after he flips the wheel over. Explain.
A uniform 30kg ladder (length =7.50m) leans against a smooth vertical wall. The base of the ladder is 12 ft from the wall. If the coefficient of friction between the ground and the ladder is 0.20, h
Assume that the effects of air resistance were negligible, that the height of the center of gravity was 1.08 m at takeoff, and that the height of the center of gravity at the landing was 0.46 m. How
What magnitude of field is needed to bend these protons in a circular arc of diameter 1.74m?
A cylindrical tank is 50.0 ft deep, 31.0 ft in diameter, and filled to the top with water. A flashlight shines into the tank from above. What minimum angle? Can its beam make with the water surface
Write Newton's law of gravitational force between you (mass m) and the earth (mass ME, radius RE) in the form of an equation.
A copper wire of diameter 2mm carries 12A of current for an electric stove. Assuming the resistivity of copper of 1.7 * 10^(-8) omega.m, the power dissipated in 2 m length of the wire is:
Two capacitors C1=2.5mF and C2=5.0mF are connected in parallel. If a voltage of V=120 volts is applied across the capacitors, what is the energy stored in capacitor C2?
Calculate the launch speed of a projectile that rises vertically above the earth to an altitude equal to one earth radius before momentarily coming to rest. Beware you cannot use the old expression
A 10.5-kg uniform board is wedged into a corner and held by a string at a 50 degree angle. Calculate the tension in the string. Hint: take torques about the corner and assume any length for the boar
The corner opposite to (and most distant from) point P has charge Q = 47 nanocoulomb. The two corners nearer to P have charges +5Q and -4Q, respectively. Assuming that the potential V = 0 at a great