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A compact fluorescent lamp (CFL) uses less energy than its equivalent incandescent bulb. How much will a person save if he/she uses a 20 W CFL instead of a 100 W incandescent lamp for 6 hours in 30 days? Electricity is priced at ₱ 8.17/kW.h.
Find the pressure exerted on a person by a few plastic blocks of total mass 42 kg, the bottom of which in contact with the person has an area of 840 cm2.
Your job is to lift 25.0 kg packaged baxes a vertical distance of 1.0 m from the ground onto the bed of a delivery truck. How many packaged boxes would you have to load onto the truck in one minute for your average output power that goes into lifting the boxes to be 0.11 hp?
A bullet is fired in a horizontal direction with a muzzle velocity of 300m/s. In absence of air resistance, how far will it have dropped in traveling horizontal distance of 20m
a. A certain battery has a 12.0 V EMF and an internal resistance of 0.005 Ω. Find the current, terminal voltage, and power dissipated by a load with 1.000 Ω.
b. How much current moves through your fingers (resistance: 1200 ohms) if you touch them to the terminals of a 6 V battery?
with solution, thank you!
A. What is the resistance of an electric frying pan that draws 12 amperes of current when connected to a 120 V circuit?
B. If your skin were very moist so that your resistance was only 1000 ohms, and you touched the terminals of a 24 V battery, how much current would you draw?
C. A certain battery has an 18.0 V EMF and an internal resistance of 0.015 Ω. Find the current, terminal voltage, and power dissipated by a load with 0.500 Ω.
with solution, thank you!
A small turbine using compressed air has a power output of 100 W.
The enthalpy of the air at the inlet is 320 kJ/kg and the enthalpy at the outlet is 240 kJ/kg. Assume the process is adiabatic and the change in the kinetic energy is negligible. Compute the mass flow rate.
A 75 kg. block of wood rest on the top of the smooth plane surface, whose length is 4 meters and whose altitude is 1.0 meter. How long will it take for th block to slide down to the bottom of the plane when released?
The work done on a stretching a spring it to 3.50 cm from its equilibrium length is 14.0 3. (a) How much force is required to stretch it at that
distance? (b) If a block of mass 2.75 kg moving at 4.8 m/s hits and runs into the same spring at its unstretched length, what is maximum compression of the spring?
A ball is thrown from a tower 42 m. high above the ground with a velocity of 270 m/sec directed at 280 from the horizontal. How long will the ball hit the ground?
