physics

A faulty barometer reads 72.6cm Hg when the atmospheric pressure is 75.0cm Hg. Calculate the atmospheric pressure when the barometer reads 72.0cn Hg

A. 79.4cm Hg B. 74.38cm Hg C. 74.2cm Hg D. 69.4cm Hg Correct Answer: Option B B. 74.38cm Hg Explanation…

6 years ago

When a metal ball is heated through 30°C, its volume becomes 1.0018cm³. If the linear expansivity of the material of the ball is 2.0 x 10^-5 K‾¹, calculate its original volume

A. 1.0000cm³ B. 1.0020cm³ C. 1.0036cm³ D. 1.0180cm³ Correct Answer: Option A A. 1.0000cm³

6 years ago

On a cold day, a concrete floor feels colder to the bare foot then a mat on the same floor because the?

A. is better conductor of heat than the foot B. mat loses heat to the barefoot at a faster rate…

6 years ago

Which of the following values on the absolute scale of temperature is the ice point?

A. 0K B. 32K C. 100K D. 273k Correct Answer: Option D D. 273k

6 years ago

When compared with water, mercury is preferred as a thermometric liquid because?

A. has a higher density B. has lower specific heat capacity C. exhibits anomalous thermal expansion D. contains molecules which…

6 years ago

A loaded spring performs simple harmonic motion with an amplitude of 5cm. If the maximum acceleration of the load is 20cms‾¹, calculate the angular frequency of the motion

A. 2 rads‾¹ B. 4 rads‾¹ C. 5 rads‾¹ D. 10 rads‾¹ Correct Answer: Option B B. 4 rads‾¹ Explanation…

6 years ago

A ball bearing is projected vertically upwards from the ground with a velocity of 15ms‾¹. Calculate the time taken by the ball to return to the ground [g = 10ms‾²]

A. 1.5s B. 3.0s C. 5.0s D. 7.5s Correct Answer: Option B B. 3.0s

6 years ago

The bob of a single pendulum has a mass of 0.02kg. Determine the weight of the bob [g = 10ms‾²]

A. 0.02N B. 0.20N C. 20.00N D. 200.00N Correct Answer: Option B B. 0.20N Explanation Wt = mg = 0.02…

6 years ago

A force acting on a body causes a change in the momentum of the body from 12kgms-1 to 16kgms-1 in 0.2s. calculate the magnitude of the force

A. 140.0N B. 20.0N C. 4.0N D. 0.8N Correct Answer: Option B B. 20.0N Explanation F = (mv−mu)/t =(16−12)/0.2 =20N

6 years ago

A body of mass 8kg moving with a speed of 30ms-1 is brought to rest in 2.5s by a constant retarding force. Calculate the magnitude of the force.

A. 240N B. 96N C. 20N D. 9N Correct Answer: Option B B. 96N Explanation F = ma = mv/t=(8×30)/2.5…

6 years ago
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