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Questions in physics

[Homework Help] 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).

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

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

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

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

[Homework Help] 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.

[Homework Help] 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?

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

[Homework Help] 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.

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