a 3.00 kg object has a velocity of ( 6.00 i – 2.00 j) m/s. (a) what is its kinetic energy at this moment? (b) what is the net work done on the object if its velocity changes to (8.00 i 4.00 j) m/s?

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

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.

Use vsepr theory to predict the molecular geometry of the molecule hcn.