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Water at a gauge pressure of 3.8 atm at street level flows into an office building at a speed of 0.45 m/s through a pipe 4.2 cm in diameter.Calculate the flow velocity in such a pipe on the top floo
A planet's moon travels in an approximately circular orbit of radius 5.4 107 m with a period of 7 h 21 min. Calculate the mass of the planet from this information
a 5 kg mass is attached to the end of a 1.0-m string. The system is whirled in a horizontal circular path. What is the maximum speed of the mass if the string is not to break
A 1.5 mm-diameter, 40 cm -long copper wire carries a 4.5 A current. What is the potential difference between the ends of the wire
Using Lorentz Law: You are given a charge moving between two parallel plates. Find the current (I) of a loop given a straight wire
A window air conditioner has an average coefficient of performance of 2.3. In a futile attempt to cool a bedroom, Determine the net heat added to the room by operating the air conditioner in this man
A Carnot engine has an efficiency of 0.325, and the temperature of its cold reservoir is 414 K. what amount of heat is put into the engine
Joey, whose mass is 37kg , stands at rest at the outer edge of the frictionless 250kg merry-go-round, 1.9m from its center. The merry-go-round is also at rest. What is the final angular speed of the
A lamp hangs vertically from a cord in a descending elevator with a constant deceleration a. If the tension in the cord is T0, answer the following, What is the lamp's mass
The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.69 m and 1.02 m, respectively. Calculate the speeds of the tips of both rotors
Three point charges, -4.9 x 10-9 C, -9.7 x 10-9 C, and +7.1 x 10-9 C, are fixed at different positions on a circle. What is the radius of the circle
a plane whose airspeed is 200km/h heads north. But a 100km/h northeast wind suddenly begins to blow. what is the excelerating velocity of the plane
Assume the steel in the body of an automobile has an emissivity of 0.3 and a specific heat of 450 J/Kg-degree C. What temperature will the top of the hood reach
An electron is released from rest at the negative plate of a parallel plate capacitor and accelerates to the positive plate, What is the kinetic energy of the electron just as it reaches the positive
A lead block is suspended from the underside of a 0.8 kg block of wood of density of 720 kg/m3. determine the mass of the lead block
A uniform disk of radius 0.517 m and unknown mass is constrained to rotate about a perpendicular axis through its center. Find the mass of the disk
The lowest outdoor temperature ever recorded on Earth was %u2212128.6 %u25E6F, recorded at Vostok Station, Antarctica, in 1983. What is this temperature on the Kelvin scale
A non-uniform beam of length 4.41m and weight 1.02kg makes an angle of 25.2 with the horizontal. Find the vertical component of the force exerted on the beam by the pivot
A solenoid of length 5.0 cm and diameter 0.87 cm is wound with 162 turns per cm. The current is decreasing at a rate of 38.0 A/s. What is the induced emf in the entire solenoid
A 1260 kg car pushes a 2140 kg truck that has a dead battery. When the driver steps on the accelerator, find the magnitude of the force that the car exerts on the truck?
A 50 kg crate slides down a ramp that is inclined by 30 degrees from the horizontal. Calculate the amount of energy lost by the crate due to friction in its journey down the ramp
A Girl is pushing on a 45 kg dresser with 300 N of force. The dresser has a coeficient of statice friction of 0.83, How much is the force of friction on the dresser
A block is attached to a chord passing over a pulley through a hole in a horizontal frictionless surface. what is the new angular velocity
A positive charge of q1 is located 4.40 m to the left of a negative charge q2. The charges have different magnitudes. How far to the left of the negative charge is one spot
Two identical capacitors store different amounts of energy: capacitor A stores 2.4 x 10-3 J, and capacitor B stores 1.3 x 10-4 J. Find the voltage across the plates of capacitor A