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Questions in physics

📝 Answered - Which one of the following temperatures is equal to 5°C? A) 278 K B) 41 K C) 465 K D) 0 K

📝 Answered - Our ears are best at hearing A. ultrasonic sound. B. both of these C. infrasonic sound. D. none of the above

📝 Answered - b) (i) X-rays are said to have harmful effects on human beings when used for a long time. Explain the effects that x-rays cause to humans. (03 marks) How do x-rays differ from light rays? (02 marks)

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

📝 Answered - Select the correct answer. How is mass defect determined? A. comparing the mass of the neutrons with the mass of the protons B. comparing the mass of the nucleus with the number of neutrons C. comparing the mass of the nucleus with the masses of the protons and neutrons D. comparing the mass of the protons with the number of electrons

📝 Answered - What is the energy of an electromagnetic wave that has a frequency of $8.0 \times 10^{15} Hz$ ? Use the equation $E=h f$, where $h=6.626 \times 10^{-34} J \cdot s$. A. $1.2 \times 10^{49} J$ B. $1.2 \times 10^{-49} J$ C. $5.3 \times 10^{18} J$ D. $5.3 \times 10^{-18} J

📝 Answered - Select the best answer for the question. A circuit with resistance of 25 ohms is carrying a current of 2. How much heat, in watts, is developed? A. 450 B. 1250 C. 50 D. 100

📝 Answered - The direction and speed of an object is described by its A. displacement B. average speed C. velocity D. average displacement

📝 Answered - Estimate the quantity of heat needed to melt 150 g of ice at $-10^{\circ} C$ to water at $15^{\circ} C$ [SHC of water $=4200 Jkg ^{-1} k ^{-1}$] [SHC of ice $=2100 Jkg ^{-1} k ^{-1}$ ], [SHC of ice $=3.36 \times 10^5 Jkg ^{-}$]

📝 Answered - What is the mass of a crate if a force of 200 N causes it to accelerate at [tex]$8 m / s ^2$[/tex]? (Formula: [tex]$F=m a$[/tex])