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Questions in physics

[Jawaban] (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?

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

[Jawaban] Explain the work-energy theorem, including the direction energy moves and how it relates to positive and negative work.

[Jawaban] You are measuring the diameter of a small steel rod. The main scale reading is 5 mm, and the thimble scale coincides perfectly at the 28th division. Calculate the diameter of the steel rod.

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

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

[Jawaban] Which type of star cluster forms from tightly packed groups of older stars? A. binary B. eclipse C. globular D. open

[Jawaban] A bullet of mass m and charge q is fired towards a solid uniformly charged sphere of radius R and total charge +q. If it strikes the surface of sphere with speed u, find the minimum speed u, so that it can penetrate through the sphere. (Neglect all resistance forces or friction acting on bullet except electrostatic forces.) (a) \(\frac{q}{\sqrt{2\pi \epsilon_0 mR}}\) (b) \(\frac{q}{\sqrt{4\pi \epsilon_0 mR}}\) (c) \(\frac{q}{\sqrt{8\pi \epsilon_0 mR}}\) (d) \(\frac{\sqrt{3}q}{\sqrt{4\pi \epsilon_0 mR}}\)

[Jawaban] A solid rubber ball dropped from a certain height above a swimming pool takes 0.3 seconds to reach the surface of the water (stage 1). The ball enters the water and reaches its maximum depth after 0.2 seconds (stage 2). Air resistance is negligible. Which one of the following statements is TRUE? A. Both the mechanical energy and momentum of the ball are constant during both stages (0.5 seconds). B. Both the mechanical energy and momentum of the ball are constant during stage 1 (first 0.3 seconds). C. Only the mechanical energy of the ball remains constant during both stages (0.5 seconds).

[Jawaban] Select the two correct phrases to complete the sentence below: "Angular momentum, _______ resisting force of the gyro to external torque." Options: A. The high, the great B. Be high, be great C. Is highest, is greatest D. Is high, is great E. The higher the, the greater the