QUESTIONS AND ANSWERS

Question A student stands 20 m away from the foot of a tree and observes that the angle of elevation of the top of the… Read More »A student stands 20 m away from the foot

Question In fusion of hydrogen isotopes into helium the decrease in mass is about 0.65%. Calculate the energy obtainable when 1.0 gram of hydrogen is… Read More »In fusion of hydrogen isotopes into helium the decrease in mass is about 0.65%

Question In a thermonuclear reaction the total initial mass is 5.02 x 10-27 kg and the total final mass is 5.01 x 10-27 kg. What… Read More »In a thermonuclear reaction the total initial mass is 5.02 x 10^-27 kg

Question In a nuclear reaction the mass defect is 2.0 x 10-6 g. Calculate the energy released, given that the velocity of light is 3.0… Read More »In a nuclear reaction the mass defect is 2.0 x 10^-6g. calculate the energy released

Question calculate the wavelength of an electron of mass 9.1×10-31 kg moving with a velocity of 2.0×106 m/s. Plancks constant, h = 6.63 x 10-34Js.… Read More »calculate the wavelength of an electron of mass 9.1×10^-31 kg moving with a velocity of 2.0×10^6m/s

Question A waterfall is 420 m high, calculate the difference in temperature of the water between the top and bottom of the waterfall assuming no… Read More »A waterfall is 420 m high calculate the difference in temperature of the water between the top and bottom of the waterfall

Question How does air resistance affect the acceleration of a falling parachute? Read: Find the acceleration when the velocity is 0. Answer Air resistance, or… Read More »How does air resistance affect the acceleration of a falling parachute?

Question find the acceleration when the velocity is 0. Read: calculate the molarity of the solution. (assume a density of 1.05 g/ml for the solution.)… Read More »Find the acceleration when the velocity is 0.

Question An aqueous KNO3 solution is made using 77.8 g of KNO3 diluted to a total solution volume of 2.04 L. Calculate the molarity of the solution. (assume… Read More »calculate the molarity of the solution. (assume a density of 1.05 g/ml for the solution.)

Question which object will sink in freshwater, which has a density of 1.0 g/cm3? Final Answer In a freshwater, an object will sink if its… Read More »which object will sink in freshwater, which has a density of 1.0 g/cm3?

Question What is the density of an object with a mass of 100 g and a volume of 50 cm3? Final Answer The final answer… Read More »what is the density of an object with a mass of 100 g and a volume of 50 cm3?

Question a book has a mass of 50 kg and an acceleration of 5 m/s2. what is the force on the book? Final Answer We… Read More »a book has a mass of 50 kg and an acceleration of 5 m/s^2. what is the force on the book?

Question At what height is an object that has a mass of 50kg, if its gravitational potential energy is 9800j? Final Answer When we use… Read More »at what height is an object that has a mass of 50kg, if its gravitational potential energy is 9800j?

Question what length of copper wire, 0.462 mm in diameter, has a resistance of 1.00 ω? Answer: The task that we have at hand involves… Read More »what length of copper wire, 0.462 mm in diameter, has a resistance of 1.00 ω?

Question calculate the velocity a spherical raindrop would achieve falling from 5.00 km Answer The spherical raindrop falling from a height of 5.00 kilometres would… Read More »calculate the velocity a spherical raindrop would achieve falling from 5.00 km