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Questions in physics

[Answered] A cook uses a ladle to stir a pot of warm soup. The soup is at a temperature of 85°C, and the ladle is at 25°C. Which sentence correctly describes heat flow in this system? A. Heat will flow from the ladle to the soup until they reach the same temperature. B. Heat will flow from the soup to the ladle until they reach the same temperature. C. Heat will flow from the soup to the ladle because heat always flows from liquids to solids. D. Heat will flow from the ladle to the soup because heat always flows from solids to liquids.

[Answered] A solid cube of side length 10 cm at 25 °C is heated. What will be the increase in its volume at 125 °C if its coefficient of linear thermal expansion is 9 × 10⁻⁶ K⁻¹? (Ans. 2.7 cm³)

[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] 4. Energy transfer is: a. The movement of energy from one object to another. b. Inherent in all objects. c. Static in solids. 5. Insulators are: a. Substances that transfer heat energy easily. b. Substances that do not transfer heat energy easily. c. All substances. 6. Convection is: a. The way that heat energy flows through liquids and gases. b. Transfer of heat energy by electromagnetic waves. c. A space where there is no matter. 7. Radiation is: a. Energy striking a surface and disappearing. b. Energy which is absorbed by an object. c. The transfer of heat energy by electromagnetic waves. 8. A dynamo is: a. Fan-like machines that turn to produce mechanical energy. b. Small generator that transfers mechanical energy into electrical energy. c. A machine in a power plant that converts mechanical energy to electrical energy. 9. In an energy efficient system: a. The energy produced must equal the energy which is needed. b. No energy must be lost. c. The energy gained must be greater than the energy lost. 10. Conduction is: a. The transfer of heat between liquids that are in direct physical contact with each other. b. The transfer of heat between solid objects that are not in direct physical contact with each other. c. The transfer of heat between solid objects that are in direct physical contact with each other.

[Answered] Two parallel rectangular plates measuring 80 mm by 120 mm are separated by 4 mm of mica and carry an electric charge of 0.48 MC. The Voltage between the plates is 500 V. Calculate: (a) the electric flux density (b) the electric field strength and (c) the capacitance of the capacitor.

[Answered] The laws of static friction are applicable when: A) Applied force is higher than limiting static frictional force and body is stationary B) Applied force is lower than limiting static frictional force and body is stationary C) Applied force is higher than limiting static frictional force and body is in motion D) Applied force is lower than limiting static frictional force and body is in motion

[Answered] Which of the following statements is incorrect about the term "impulse"? 1. It is a vector quantity. 2. If impulse and initial momentum of body is known, its final momentum can be calculated. 3. Its SI unit is kg.m/s. 4. Impulse is a product of mass and velocity.

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