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answer all the sub parts of the question in detail
A firefighter who weighs 712 N slides down a vertical pole with an acceleration of 3.00 m/s2, directed downward. What are the
(a) Magnitude and
(b) Direction (up or down) of the vertical force on the firefighter from the pole and the
(c) Magnitude and
(d) Direction of the vertical force of the pole on the firefighter?
A spring with a spring constant of 500N/m is used to propel a .45kg mass up an inclined plane. find the speed of the mass as it reaches the top of the plane
A vertical straight wire carrying an upward 21A current exerts an attractive force per unit length of 8.7x10^4 N/m on a second parallel wire 6.0cm away
A lightning bolt might carry a current of 1.00 multiply.gif 10 4 A for a short time. What is the resulting magnetic field 80 m from the bolt? Presume that the bolt extends far above and below the point of observation.
Three resistors are connected in series across a battery, What is the greatest voltage that the battery can have without one of the resistors burning up, How much power does the battery deliver to the circuit
if a body is displaced horizontly through 5mts. by a constantforce, the work done is 10Joules. then find the mass of the body
The escape speed from a distant planet is 45 km/s. If the acceleration of gravity on the planet surface is 12.5 m/s2, What is the radius of the planet
The motion detector used in a physics lab sends and receives 49.55 kHz ultrasonic pulses. find the wavelength of the waves emitted by the motion detector
One of the most efficient engines ever built is a coal-fired steam turbine in the Ohio valley, driving an electric generator as it operates between 430°C and 1870°C. Evaluate its maximum theoretical efficiency
A car starts from a speed of 10 m/s with an acceleration of 2 m/s^2. What is the time needed for the car to reach 30 m/s?
Calculate the resistivity for each data point and plot resistivity versus temperature. Find an equation for the resistivity as a function of temperature through a least squares analysis. Use this equation to calculate the resistance at 0 °K
over a time interval of 1.81 years the velocity of a planet orbiting a distant star reverses direction changing from
A 23 gram bullet traveling 230m/s penetrates a 2kg block of wood and emerge clearly at 170m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after bullet emerges.
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