Physics Answers

• An aircraft attempt to fly due north at 100km per hour.if the wind blows against it from east to west at 60km per hour.it resultant velocity is?

A hydraulic lift has pistons with diameters 8.00 cm and 36.0 cm, respectively. If a force of 825 N is exerted at the input piston, what maximum mass can be lifted by the output piston

Two charges lie in a line along the x axis. Charge 1 is q1 = 0.65 C and charge 2 is q2 = 2.45 C. They are each a distance of d = 0.021 m from the origin.

What is the distance on the x-axis from the origin at which the electric field will be zero. Give your answer in meters.

The frequency of vibration of a mass m suspended from a spring constant k us given by the relation F=Cm^xK^y is the dimensionless constant determine x and y

Two forces act on an object. The first is a horizontal 50N force. The second is a 40 N force acting at an angle to the horizontal. Use a graphical method drawn to a scale of 1mm:1N to find the resultant if the 40N force is inclined at 30° to the horizontal

A projectile leaves the ground at an angle 30° to the horizontal. The kinetic energy is E neglecting the air resistance . Find in terms of E it's kinetic energy at the highest point of motion

1. a) What is the rate of energy loss in watts per square meter through a glass window 1.8 mm thick if the outside temperature is -16°F and the inside temperature is +76°F? (b) A storm window having the same thickness of glass is installed parallel to the first window, with an air gap of 5.3 cm between the two windows. What now is the rate of energy loss if conduction is the only important energy-loss mechanism? (The thermal conductivity of window glass is 1.0 W/m·K, and of air is 0.026 W/m·K.)
2. Consider a slab of face area A and thickness L. Suppose that L = 34 cm, A = 63 cm², and the material is copper. If the faces of the slab are maintained at temperatures T_H = 199°C and T_C = 21°C, and a steady state is reached, find the conduction rate through the slab. The thermal conductivity of copper is 401 W/m·K.

A 50 Hz sinusoidal voltage has rms value of 200 V. At t=0, the instantaneous value is positive and half of its maximum value. Write down expression for voltage and sketch the waveform

a baseball is thrown to a distance of 890 m at an angle of 30 degree above horizontal. what is the initial speed of the baseball

An electron of charge e is moving at a constant velocity u, along the x-axis. It enters a region of constant electric field E, which is pointing perpendicular to the x-axis. The electron moves in a parabola. Which of the following represents the focal length of the parabola? Neglect any effects due to gravity. (for a parabola of type x2=4ay, a is the focal length)