Why is it valuable to have practice observing, measuring, and predicting an object in projectile motion? The two "separate" models used in today’s experiments are both based on the same related set of kinematic equations. Why did the models not predict your measurements with the same degree of accuracy?

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.

When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the force that the object exerts?