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Questions in physics

[Free] What causes a disturbance that results in a wave?

[Free] A projectile is launched off the roof of a 180-meter-tall building close to its edge, where the initial velocity's horizontal component is [tex]$20 m / s$[/tex] and its vertical component is [tex]$25 m / s$[/tex]. The projectile lands on the ground below. How far from the building's side (in meters) does the projectile land? Round your answer to the nearest hundredth (0.01).

[Free] 6. When does a coil's self-induction change? (1) A coil's number of turns is reduced. (2) A rod made of iron is inserted into it. Justify.

[Free] [Clean the question above and then proceed with classification]

[Free] Select the correct answer. Which is true about the total mechanical energy of a pendulum in the absence of friction? A. It is conserved when PE=KE B. It is conserved when PE> KE C. It is conserved when PE < KE D. It is conserved for all positions of the pendulum.

[Free] Define transformation of energy. Illustrate it with two examples.

[Free] Which one of the following measuring instruments is used to measure light intensity? A. Galvanometer B. Photo meter C. Current meter D. Volt meter

[Free] Which equation demonstrates that nuclear fusion forms elements that are heavier than helium? ${ }_1^2 H +{ }_1^3 H \longrightarrow{ }_2^4 He +{ }_0^1 n$ ${ }_8^{16} O +{ }_2^4 He \longrightarrow{ }_{10}^{20} Ne$ ${ }_{82}^{235} U+{ }_0^1 n \longrightarrow{ }_{53}^{131} \mid+{ }_{39}^{89} Y+16_0^1 n$ ${ }_{92}^{235} U +{ }_0^1 n \longrightarrow{ }_{42}^{95} Mo +{ }_{57}^{139} La +2{ }_0^1 n +7{ }_{-1}^0 e$

[Free] The equation of trajectory of a projectile is given as y = 2x - (x^2)/2. The maximum height of the projectile is (Symbols have usual meanings and SI unit): (1) 4 m (2) 1 m (3) 2 m (4) 10 m

[Free] Class 4 listed the particles in a solid. Correct their mistakes. | Particles in a solid | Tick (✔) if correct | Correct answer | |-------------------------------|---------------------|----------------| | are not moving | ✓ | | | are arranged untidily | | | | are all the same size | | | | are tightly packed together | ✓ | | | are all touching | ✓ | | Write T or F beside each statement. Correct the false statements.