Calculate the magnitude of the normal force on a 15.2 kg block in the following circumstances. (Enter your answers in N.) (a) The block is resting on a level surface. N (b) The block is resting on a surface tilted up at a 35.8 angle with respect to the horizontal. N (c) The block is resting on the floor of an elevator that is accelerating upward at 3.53 m/s N (d) The block is on a level surface and a force of 155 N is exerted on it at an angle of 35.8 below the horizontal. N

What type of nuclear decay causes the atomic number of an element to increase by 1?

Select the correct answer. what does the process of natural selection involve?

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.