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Questions in physics

[Done] Compare the following. a. The distance from Neptune to the Sun is 4.55 x 10¹² m while the distance of the Earth from the Sun is 1.49 x 10¹¹ m. b. The size of a plant cell is 0.0001275 m while the size of a red blood cell is 7×10⁻⁶ m. c. The diameter of the Sun is 1.4 x 10⁹ m while the diameter of the Earth is 1.2746 x 10⁷ m.

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

[Done] A particle is moving in a straight line with a constant acceleration. It changes its velocity from 10 m/s to 20 m/s, while passing through a distance of 135 m in t seconds. The value of t is: (a) 10 (b) 1.8 (c) 12 (d) 9

[Done] Convert the following masses into kilograms. a) [tex]50475 rg[/tex] b) [tex]406 dg[/tex]

[Done] In a scenario where a thin metallic strip on a vernier caliper descends from the upper edge to the lower edge and makes constant contact with the surface of a beaker, the main scale displays a reading of 6.4 cm with a vernier constant of 1.1 mm, and the fourth vernier scale division aligns precisely with a main scale division. Determine the precise depth of the beaker, assuming there is no zero error.

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

[Done] Which process would correctly calculate the frequency of a wave? A. dividing speed by wavelength B. dividing frequency by wavelength C. multiplying frequency by period D. dividing wavelength by period

[Done] A block of 150 kg mass is placed on a rough horizontal plane. The coefficient of static friction between the block and the plane is 0.33. Determine the force required to prevent the block from moving in each of the following cases: (i) If the block is pushed by a horizontal force. (ii) If the block is pulled by an inclined force, inclined at 20° to the horizontal. (iii) If the block is pushed by an inclined force, inclined at 20° to the horizontal.

[Done] With air by blowing continuously, what do you think happened to the air inside the balloon? A. It becomes solid. B. It changes its volume. C. It disappears. D. It spreads out.

[Done] (b) Some pieces of stainless steel cubes at -18 °C are added into 250 g of water at 15 °C. The mass of each steel cube is 50 g. The specific heat capacities of stainless steel and water are 502 J kg⁻¹ °C⁻¹ and 4200 J kg⁻¹ °C⁻¹ respectively. If the final temperature of the water is 9.7 °C, how many cubes are added?