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Questions in physics

📝 Answered - A 0.160 kg ball attached to a light cord is swung in a vertical circle of radius 70.0 cm. At the top of the swing, the speed of the ball is 3.26 m/s. The center of the circle is 1.50 m above the floor. Calculate the speed of the ball when the cord is 30.0° below the horizontal.

📝 Answered - Explain how to determine the volume of an irregularly shaped object, such as a rock.

📝 Answered - A car advertisement states that a certain car can accelerate from rest to 70 km/h in 7 seconds. Find the car’s acceleration in m/s².

📝 Answered - How does thermal energy heat a house? What devices and systems are involved?

📝 Answered - Will current flow more easily through a thick wire or a thin wire of the same material when connected to the same source? Why?

📝 Answered - A resistance of 10 ohms is bent in the form of a closed circle. What is the effective resistance between the two points of any diameter of this circle?

📝 Answered - If a Ferrari, with an initial velocity of 10 m/s, accelerates at a rate of 50 m/s\(^2\) for 3 seconds, what is its final velocity?

📝 Answered - Where does friction occur? Can it happen in liquids, air, or with solids?

📝 Answered - What two things must you know to find the momentum of an object?

📝 Answered - How is momentum similar to inertia? Explain.