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A 5.0 kg hanging weight is connected by a string over a pulley to a 9.0kg block sliding on a flat table. If the coefficient of sliding friction is 0.20; what is the rate of acceleration of the system?
A moderate wind accelerates a pebble over a horizontal xy plane with a constant acceleration a = (4.40 m/s2)i + (7.00 m/s2)j. At time t = 0, the velocity is (4.2 m/s)i. What are magnitude and angle of its velocity when it has been displaced by 11.7 m..
A piece of Nichrome wire has a radius of 5.2 x 10-4 m. It is used in a laboratory to make a heater that dissipates 3.50×102 W of power when connected to a voltage source of 100 V. Ignoring the effect of temperature on resistance, estimate the necessa..
A magnetic field has a magnitude of 0.0011 T, and an electric field has a magnitude of 3.6 × 103 N/C. Both fields point in the same direction. A positive 2.3-?C charge moves at a speed of 4.1 × 106 m/s in a direction that is perpendicular to both fie..
A small block of mass m = 140 g is released from rest at point along the horizontal diameter on the inside of a frictionless, hemispherical bowl of radius R = 28.0 cm as shown in the figure below. the height = 2R/3 = c (d) Calculate its kinetic energ..
High power lasers in factories are used to cut through cloth and metal. One such laser has a beam diameter of 0.407 mm and generates an electric ?eld at the target having an amplitude 0.985 MV/m.
When the 210kg Genesis Mission capsule crashed with a speed of 311km/h, it buried itself 81.0cm deep in the desert floor. Assuming constant acceleration during the crash, at what average rate did the capsule do work on the desert?
A flywheel of mass 185 kg has an effective radius of 0.60 m (assume the mass is concentrated along a circumference located at the effective radius of the flywheel). (a) How much work is done to bring this wheel from rest to a speed of 120 rpm in a..
A piece of copper tubing used in plumbing has a length of 85.0cm and an inner diameter of 1.40cm at 20 degrees C. When hot water at 90 degrees C flows through the tube, what is the change in its cross-sectional area?
In the steady state 1.8 1018 electrons per second enter bulb 1. There are 6.3 1028 mobile electrons per cubic meter in tungsten. The cross-sectional area of the tungsten filament in bulb 1 is 1 10-8 m2. The electron mobility in hot tungsten is 1.2 10..
A stunt pilot is attempting to drop a water ballon from a moving air plane onto a target on the ground. the plane moves at a speed of 79.69 m/s and a 39 above the horizontal when the ballon is released. at the point of release the plane is at an alti..
Two concentric conducting spheres of radii a = 5 cm and b = 10 cm have a potential difference V = 100 V between them. What is the charge carried by each sphere
Two boxes of mass 4.70 and 2.70 kg are in contact and are accelerated across a horizontal surface by an force of 28.24 N applied parallel to the surface and pushing on the lighter box. Find the acceleration of the two boxes
You buy a plastic dart gun, and being a clever physics student you decide to do a quick calculation to find its maximum horizontal range. What is the maximum horizontal range of your gun
If the spring constant k = 5.0\times 10^2 \rm \;{N/m}, the baby has a mass m = 11\;{\rm kg}, and the baby's legs reach a distance d = 0.15\; \rm m from the bouncer, what should be the height h of the "empty" bouncer above the floor?
A 2.00-mol sample of a diatomic ideal gas expands slowly and adiabatically from a pressure of 5.02 atm and a volume of 12.8 L to a final volume of 29.0 L. What are the initial and final temperatures
Suppose you hear a clap of 4.63 seconds after seeing the lightning stroke. how far are you from the lightning stroke
A battery has three cells connected in series, each with an internal resistance of 0.014Ω and an emf of 2.00 V. How much current is in each cell
The index of refraction for red light in material X is measured at 1.70. What is the index of refraction for blue light in material X
What is the flow speed of the medicine through the needle. What is the least force the nurse needs to apply to the syringe.
The electric motor of your new 2012 Chevrolet Volt is rated at 111 kW [W=J/s]. The mass of the car is 1600kg. How much time will it take to reach the higher speed
Two soccer players start from rest, 33 m apart. They run directly toward each other, both players accelerating. How much time passes before the players collide
An RLC circuit of a 2 picoF capacitor, a 4.4 ohm resistor, Find the phase shift in radians between the current and the driving voltage
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