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physics

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68 questions


The half life of an element is...
The half life of an element is 12hrs. If the initial mass is 50g, what mass will be left after 2days. 
2 days ago 1 answer(s) 2 votes


An object weighs 100N on the earths surface. find its....
An object weighs 100N on the earths surface. Find it's weight at a point P with orbital radius 2R (g=10Nkg-1).  A. 40.0N B. 3...
3 days ago 1 answer(s) 2 votes


An electric lamp has the following makings 230V, 250W. How l...
An electric lamp has the following makings 230V, 250W. How long would it take the lamp to use one kilowatt-hour when connected to a 230V mains? 
3 days ago 1 answer(s) 2 votes


The volume of a fixed mass of a gas varies inveresely as the...
The volume of a fixed mass of a gas varies inveresely as the pressure on it, provided the temperature is constant. The statement is A. Pressure law
29 days ago 1 answer(s) 2 votes


How much work is needed to stop a 20g bullet moving with a s...
How much work is needed to stop a 20g bullet moving with a speed of 150ms-1
5 months ago 2 answer(s) 1 votes


What happens when a white screen is illuminated by red and g...
which of the following would appear when a white screen is illuminated by red and green light A. Red B. Purple C. Yellow D. G...
4 months ago 1 answer(s) 2 votes


The vacuum in thermoflask reduces heat loss resulting from
The vacuum in thermoflask reduces heat loss resulting from A. radiation only B.conduction and convection only C. radiation and convec...
1 month ago 1 answer(s) 3 votes


A loaded spring is set in simple harmonic motion. The force ...
A loaded spring is set in simple harmonic motion. The force that tends to restore the load to its equilibrium is A. adhesive B. elastic ...
1 month ago 1 answer(s) 3 votes


Which of the following waves is not mechanical
Which of the following waves is not mechanical A. Waves in pipes B. Water waves C. Radio waves D.  Sound waves
1 month ago 1 answer(s) 3 votes


A body of mass 2kg is released from a point 100m above the g...
A body of mass 2kg is released from a point 100m above the ground. Calculate its kinetic energy 80m from the point of release A. 1600J B. 900...
1 month ago 1 answer(s) 4 votes