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A 75kg hiker climbs to the top of a 4100m -high mountain. The climb is made in 5.0h starting at an elevation of 3000m.
a) Calculate the work done by the hiker against gravity.
b) Calculate the average power output in watts.
c) Calculate the average power output in horsepower.
d) Calculate assuming the body is 20 % efficient, what rate of energy input was required.
An engine has an efficiency e1. The engine takes input heat QH from a hot reservoir and delivers work W1. The heat rejected by this engine is used as input heat for a second engine.
Find the force on each side of the loop and the torque acting on loop.
What's the advantage of launching space vehicles from high flying aircraft in place of from the ground.
the position of a cart that is oscillating on a spring is given by the equation x= 12.3 cm cos [(1.26 s-1)t], velocity and acceleration of the cart
What effect will increase in temperature from 25 degree Celsius to 32 degree Celsius of the metal metre stick have on the measurement of the dimension of rectangular block? Why are corrections not generally essential for this effect.
A 1.9-kilogram mud ball drops from rest at a height of 18 m. If the impact between the ball and the ground lasts 0.56s, Find the final velocity of the 4.90-kg ball if the collision is elastic
A Molecule of DNA is 2.17 um long. The ends of the molecule become strongly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 0.78% upon becoming charged. Determine the effective spring con..
A flight attendant pulls her 65N flight bag a distance of 388m along a level airport floor at a constant velocity. The force she exerts is 38 N at an angle of 51° above horizontal.
A large wooden turntable in the shape of the flat disk has a radius of 2.00 {rm m} and a total mass of 120 {rm kg}. The turntable is initially rotating at 3 {rm rad}/{rm s} about a vertical axis through its center.
A simple pendulum has a length of 52.5 cm and makes 83.0 complete oscillations in 2.00 min, Find the value of g at the location of the pendulum
What is the boats average speed. imagine the mass of the dishwater is large enough so its temperature doesn't change appreciably.
A car speeds past a stationary police officer while travelling 115km/h. The officer immediately begins pursuit at a constant acceleration of 10.20 km/h/s (note the mixed units), just as the driver passes the officer.
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