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Questions in physics

[Answered] Exercise 16 (Unless stated otherwise, take the acceleration due to gravity as g=10ms) 1. A particle is projected horizontally with a velocity of 40 ms from the top of a tower 80.5m above the level ground. Find how far from the bottom of the tower the particle is when it hits the ground.

[Answered] A woman starts from her home at 9:00 am, walks with a speed of 5 km/h in a straight road up to her office 2.5 km away, stays at the office until 5:00 pm, and returns home by auto with a speed of 25 km/h. Choose suitable scales and plot the distance-time (x-t) graph of her motion.

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

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

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

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

[Answered] Resistance of metal wire of length 2 m is 28 Ω at 20°C. If the diameter of the wire is 0.04 mm, then what will be the resistivity of the metal at that temperature?

[Answered] 34. The displacement of a progressive wave is represented by y = A sin (ωt - kx) where x is distance and t is time. The dimensions of ω/k are the same as those of: (A) velocity (B) wave number (C) wavelength (D) frequency 35. The incorrect statement is: (A) Dimensional analysis cannot be used to check the correctness of equations involving trigonometric functions. (B) Dimensional analysis can be used to deduce the equation which are only dimensionally correct. (C) Dimensional analysis can be used to determine the constants of proportionality. (D) Dimensional analysis can be used to deduce equations which are of product type.

[Answered] You might have a geyser, water heater, and room heater at home. How do these gadgets work? By which mode do we get heat from a room heater?

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