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Questions in physics

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

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

[Homework Help] What does it mean when work is positive? A. Velocity is greater than kinetic energy. B. Kinetic energy is greater than velocity. C. The environment did work on an object. D. An object did work on the environment.

[Homework Help] Why is it so important for you to know the individuals that you support? A. To know what kinds of food they like to eat B. To help you recognize changes in their physical condition or behavior C. To keep everyone happy D. To provide the entertainment that they enjoy

[Homework Help] The length of a train is one-third of the length of platform A, and the speed of the train is 90 km/hr. If the train can cross platforms A and B in 8 and 12 seconds, then find the length of platform B?

[Homework Help] The time taken by the earth to complete one revolution around the sun is [tex]3.156 \times 10^7 s[/tex]. The distance between the earth and Sun is [tex]1.5 \times 10^{11} m[/tex]. Find the speed of revolution of the earth.

[Homework Help] A $7.2 \times 10^{-5} C$ charge has an electric potential energy of $1.08 \times 10^{-2} J$. The electric potential, to the nearest whole number, is what?

[Homework Help] 3. Fill in the blanks: (a) John Dalton is known for __________. (b) Einstein formulated the law of __________. (c) Madam Curie discovered __________. (d) Law of natural selection was formulated by __________. (e) Newton developed __________ motion. 4. Write "Yes" for true statement and "No" for wrong statements. (a) Science is learning about animals only. (b) John Dalton formulated theory of relativity. (c) We should take precautions in the laboratory. (d) Scientific learning is learning about apparatus. (e) Funnel is used to measure water. (f) One kilometre is equal to hundred centimetres. (g) Volume of a liquid can be measured by cylinders. (h) Clinical thermometer can measure up to 100°C. (i) 4 hours is equal to 60 seconds. (j) The weight of heavier objects can be measured in kilograms.

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

[Homework Help] How much heat is required to change 15 kg of ice into water at its melting point?