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Questions in physics

[Answered] A bullet leaves a rifle with a muzzle velocity of 521 m/s. While accelerating through the barrel of the rifle, the bullet moves a distance of 0.840 m. Determine the acceleration of the bullet (assume a uniform acceleration).

[Answered] What frequency of sound has a wavelength of 75 cm?

[Answered] The close encounter hypothesis says that our solar system probably formed when another star almost collided with our Sun. True or False?

[Answered] What force stops a car from sinking into the road surface?

[Answered] How do you define two angles that will result in a range of zero for a projectile launched at an angle to the horizontal?

[Answered] If a 3.1 g ring is heated using 10.0 calories, and its temperature rises 17.9°C, calculate the specific heat capacity of the ring.

[Answered] A boy throws a stone straight upward with an initial speed of 15 m/s. What maximum height will the stone reach before falling back down?

[Answered] How do you add numbers in scientific notation if the problem is like this? \[3.72 \times 10^9 + 5.46 \times 10^8\]

[Answered] A car travels 100 km in the first two hours, stops for half an hour, and then travels 200 km in the next four hours. Find the average speed of the car.

[Answered] When water is heated and changes into steam, is that a chemical change or a physical change?