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Questions in physics

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] One end of an elastic cord is attached to a block of mass m and the other end is held keeping the cord relaxed and vertical. Relaxed length of the cord is l and there is a mark P at a height 0.8*l from the lower end. If the upper end is slowly raised, the block leaves the ground when the mark P reaches the point where the upper end of the relaxed cord initially was. Expression for the work done by the force applied by the hand is: (a) \(\frac{mgl}{16}\) (b) \(\frac{mgl}{8}\) (c) \(\frac{mgl}{5}\) (d) \(\frac{mgl}{4}\)

[Answered] What is the relation between °C, °F and Kelvin? Differentiate between clinical thermometer and laboratory thermometer.

[Answered] The acceleration of an object due to gravity is 32 feet per second squared. What is acceleration due to gravity in inches per second squared? A. $\frac{3}{8}$ inches per second squared B. $2 \frac{2}{3}$ inches per second squared C. 384 inches per second squared D. 1,024 inches per second squared

[Answered] A barometer is used to measure a. atmospheric pressure. b. absolute pressure. c. stratospheric pressure. d. gauge pressure.

[Answered] A driver of a car travelling at 52 km/h accelerates uniformly in the opposite direction. The car stops in 5 seconds. Another driver going at 3 km/h in another car applies and stops in 10 seconds on the same graph. i) Plot the graph of speed vs time (car 1). ii) Solve for the distance travelled by car (car 1).

[Answered] A particle moves in a circle of radius 25 cm at two revolutions per second. The average acceleration of the particle in half cycle in meters per sec² is: (A) π (B) 8π (C) 800π (D) 2π

[Answered] A fish under water is viewing obliquely a fisherman standing on the bank of a lake. Does the man look taller or shorter than what he is actually?

[Answered] Where in the Sun does the production of energy take place? A. the corona B. the photosphere C. the core D. the chromosphere

[Answered] Rutherford's alpha-particle scattering experiment led to the following conclusion: A) Energies of electrons in different shells are quantized B) A lot of space in an atom is empty C) Certain types of metals show photoelectric effect D) The charge on electron is quantized