physics

Which of the following surfaces will radiate heat energy best?

A. Red surface B. white surface C. black surface D. yellow surface Correct Answer: Option C C. black surface

6 years ago

Mechanical energy can be either

A. kinetic or electric B. chemical or potential C. potential or kinetic? D. electric or heat Correct Answer: Option C…

6 years ago

A plane inclined at 30o to the horizontal has an efficiency of 50%. Calculate the force parallel to the plane required to push a load of 120N uniformly on the plane

A. 50.0N B. 120.0N C. 200.0N D. 240N Correct Answer: Option B B. 120.0N Explanation V.R = 1/sinθ=1/sin30 = 2…

6 years ago

An external force of magnitude 100N acts on a particle of mass 0.15kg for 0.03s. Calculate the change in the speed of the particle

A. 50ms‾¹ B. 25ms‾¹ C. 20ms‾¹ D. 5ms‾¹ Correct Answer: Option C C. 20ms‾¹ Explanation a = F/m=1000.15=666.7 v =…

6 years ago

A swinging pendulum between the rest position and its maximum displacement possesses.

A. Kinetic energy only B. potential energy only C. gravitational energy only D. both kinetic and potential energy Correct Answer:…

6 years ago

A body accelerates uniformly from rest at 2ms‾². Calculate the magnitude of its velocity after travelling 9m

A. 4.5 ms‾¹ B. 6.0 ms‾¹ C. 18.0 ms‾¹ D. 36.0 ms‾¹ Correct Answer: Option B B. 6.0 ms‾¹ Explanation…

6 years ago

The team rectilinear acceleration means the rate of increase of?

A. velocity along a circular path in a unit time B. distance along a rectangular path in a unit time…

6 years ago

An object of mass 2 kg moves with a uniform speed of 10ms‾¹ for 5s along a straight path. Determine the magnitude of its acceleration.

A. 0 ms‾² B. 1 ms‾² C. 3 ms‾² D. 4 ms‾² Correct Answer: Option A A. 0 ms‾²

6 years ago

A body moving at a constant speed accelerates when it is in?

A. rectilinear motion B. translational motion C. circular motion D. vibrational motion Correct Answer: Option A A. rectilinear motion

6 years ago