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You are listening a soft music with a sound level of 50 dB. A subway train passes by whose sound level is 90 dB. What is the total intensity level of the combined sound in dB.
Find the volume of water ejected from the hose every second. Hence find the mass of water ejected every second. Find the backward force exerted on the gardener by the hose.
As the ball is thrown upward is the net force acting upon it greater, less, or equal to its weight? Repeat the equation for the downward motion of the ball.
A golf ball strikes a hard, smooth floor at an angle of 30.0 ° and, as the drawing shows, rebounds at the same angle. The mass of the ball is 0.047 kg, and its speed is 45 m/s just before and a
Calculate the total number of electrons in 100g of water.Avagadro number is 6.02*10^23.
Calculate the thermal energy dissipated from brakes in a 1500-kg car that descends a 17 degree hill. The car begins braking when its speed is 95 km/h.
A 0.157 kg ball is thrown straight up from 1.94 m above the ground. Its initial vertical speed is 9.60 m/s. A short time later, it hits the ground. What is the total work done by the force of gravi
When it is adjusted to a value R 2, the ammeter reads 0.25 of full-scale value. Compute the value of Ra in terms of R1 and R2.
The 30kg sack A is dropped on a spring scale from the height h=0. The platform B of the scale weighs 6 kg and the combined stiffness of the springs is 2000 N/m. Determine the maximum reading of the
What is the surface charge density inside the hollow cylinder?
Find the time it takes for a telephone call to go by the way of satellite between these cities. Ignore the curvature of the earth.
What is the net upward force on an airplane wing of area 16.1 m2 if the speed of air flow is 294 m/s across the top of the wing and 278 m/s across the bottom?
A potential difference of 90 mV exists between the inner surfaces of a cell membrane. The inner surface is negative relative to the other surface. How much work is required to eject a positive sodi
A proton moves perpendicular to a uniform magnetic field B at a speed of 1.00 X 107 m/s and experiences an acceleration of 2.00 X 1013 m/s2 in the +x direction when its velocity is in the +z direct
The mass of the first, is dropped from the same point at t = 190 ms. (a) How far below the release point is the center of mass of the two stones at t = 440 ms?
The magnetic force on the bullet is 2.90 10-10 N, directed due east. Determine the bullet's electric charge, including its algebraic sign (+ or -).
There exists a frame in which these events occur at the same time. Find the velocity of this frame with respect to S.
Write a paragraph describing three steps that must occur for a water molecule to start on the surface of hot bath water and end up on the surface of a bathroom mirror. Note wheather the phase chang
Calculate the work done by friction as a 4.0 {rm kg} box is slid along a floor from point A to point B in the figure along paths 1, 2, and 3
A 2 g lead (cp = 128 J/kg C) bullet traveling at 325 m/s is stopped by a large tree. If half the kinetic energy of the bullet is transformed into internal energy and remains with the bullet while t
A 2.0 kg box rests on a plank that is inclined at an angle of 65° above the horizontal. The upper end of the box is attached to a spring with a force constant of 360 N/m, as shown in Figure 6-3
What is its maximum range on level ground and what angle above the horizontal should it be fired to give maximum range?
The entire system is initially rotating at 0.180. Find the angular velocity if the child moves to a final position 1.10 from the center of the merry-go-round.
A candle is placed 12.0 cm in front of a convex mirror. When the convex mirror is replaced with a plane mirror, the image moves 8.5 cm farther away from the mirror. Find the focal length of the con
You have a wire of length L = 2.2 m for making a square coil of a dc motor. The current in the coil is I = 1.0 A, and the magnetic field of the motor has a magnitude of B = 0.29 T. Find the maximum