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Questions in physics

📝 Answered - A child’s toy rake is held so that its output arm is 0.75 meters. If the mechanical advantage is 0.33, what is the input arm length?

📝 Answered - An object is thrown off a cliff with a horizontal speed of 10 m/s. After 3 seconds, the object hits the ground. Find the height of the cliff and the total horizontal distance traveled by the object. a. What do you know? b. What do you need to solve for? c. What equation(s) will you use? d. What is the solution to this problem?

📝 Answered - A helicopter's speed increases from 25 m/sec to 60 m/sec in 5 seconds. What is the acceleration of this helicopter?

📝 Answered - An atom of sodium-23 (atomic number = 11) has a positive charge of +1. Given this information, answer the following: 1. How many electrons does it have? 2. How many protons does this atom have? 3. How many neutrons does this atom have?

📝 Answered - A 10-meter long ramp has a mechanical advantage of 5. What is the height of the ramp?

📝 Answered - Compare the intensity of light 2 meters away from a lit match to the intensity 6 meters away from the match.

📝 Answered - A liquid with a specific heat of 1,900 J/kg·°C has 4,750 joules of heat energy added to it. If the temperature increases from 20°C to 30°C, what is the mass of the liquid?

📝 Answered - A cannonball is launched with a speed of 170 m/s at 40 degrees above the horizontal. Find the components into which it is resolved.

📝 Answered - A compass is a magnet, and Earth is a magnet. How does the magnetism of a compass work with the magnetism of Earth to make a compass a useful tool for navigating?

📝 Answered - A bulldozer does 30,000 joules of work to push a boulder a distance of 20 meters. How much force is applied to push the boulder?