Question 4146:

• JAMB 2021

Particles of mass 10\(^{-2}\)kg is fixed to the tip of a fan blade which rotates with angular velocity of 100rad\(^{-1}\). If the radius of the blade is 0.2m, the centripetal force is?

A. 2N
B. 20N
C. 200N
D. 400N

Question 4147:

• JAMB 2021

A boy standing some distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340ms\(^{-1}\), how far is he from the cliff?

A. 680m
B. 170m
C. 34m
D. 85m

Question 4148:

• JAMB 2021

Which of the following is not a vector quantity?

A. Momentum
B. Force
C. Temperature
D. Displacement

Question 4149:

• JAMB 2021

Calculate the heat energy required to vaporize 50g of water initially at 80ºC if the specific heat capacity of water is 4.23jg\(^{-1}\)k\(^{-1}\) (specific latent heat of vaporization of water is 2260jg\(^{-1}\)

A. 530000J
B. 23200J
C. 17200J
D. 130000J

Question 4150:

• JAMB 2021

In a series R-L-C circuit at resonance, the voltages across the resistor and the inductors are 30V and 40V respectively.

What is the voltage across the capacitor?

A. 30V
B. 40V
C. 50V
D. 70V