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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] Which block is made of the densest material? | Block | Mass (g) | Length (cm) | Breadth (cm) | Height (cm) | |-------|----------|-------------|--------------|-------------| | A | 480 | 5 | 4 | 4 | | B | 360 | 10 | 4 | 3 | | C | 800 | 10 | 5 | 2 | | D | 600 | 5 | 4 | 3 |

[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] Which statement is true for objects in dynamic equilibrium? A. Objects have zero acceleration. B. Objects have non-zero positive acceleration. C. Objects have non-zero negative acceleration. D. Objects can have positive as well as negative acceleration. E. Objects have forces which are not balanced in at least one direction.

[Homework Help] Two particles move along the x-axis with uniform velocities of 8 m/s and 4 m/s. Initially, the first particle is 21 m to the left of the origin, and the second particle is 7 m to the right of the origin. The two particles meet at a distance of: 1) 35 m 2) 32 m 3) 28 m 4) 56 m

[Homework Help] What role does mass play in Newton's Second Law of Motion? A. Mass determines how much an object will accelerate when a force is applied. B. Mass does not affect acceleration. C. Mass determines the force applied. D. Mass determines the speed of an object.

[Homework Help] What kind of energy involves the flow of charged particles? A. thermal B. radiant C. electrical D. nuclear

[Homework Help] Select the best answer for the question. 12. A body is a particular amount of matter. It can be a solid, liquid, or gas. It can be described as existing in A. time and space. B. location and movement. C. motion and force. D. size and shape.

[Homework Help] Which statement describes the law of conservation of energy? A. All systems will exchange matter and energy with their surroundings. B. All systems can exchange energy, but not matter, with their surroundings. C. Energy cannot be created nor destroyed, but it changes from one form to another. D. Energy is destroyed in most chemical reactions when new products are formed.

[Homework Help] How much energy is required to melt 2 kg of gold? Use the table below and this equation: [tex]Q=m L_{\text {fusion }}[/tex] | Substance | Latent Heat Fusion (melting) (kJ/kg) | Melting Point (${ }^{\circ} C$ ) | Latent Heat Vaporization (boiling) (kJ/kg) | Boiling Point (${ }^{\circ} C$ ) | | --------- | ------------------------------------ | --------------------------- | --------------------------------------- | -------------------------- | | Aluminum | 400 | 660 | 1100 | 2450 | | Copper | 207 | 1083 | 4730 | 2556 | | Gold | 62.8 | 1063 | 1720 | 2808 | | Hellum | 5.2 | -270 | 21 | -269 | | Lead | 24.5 | 327 | 871 | 1751 | | Mercury | 11.4 | -39 | 296 | 357 | | Water | 335 | 0 | 2255 | 100 | A. 3440 kJ B. 125.6 kJ C. 1720 kJ D. 10.4 kJ