Dropping Zeros Practice

How much potential energy does a pebble of mass 4,000 mg (m) have if it is held 5 km above the ground? Potential energy is calculated using PE=mgh. (Note: use g = 10 m/s².)

Power can be calculated in two ways either by using the typical equation of work over time however it can also be calculated by multiplying the force of an object by its velocity (P=Fv). For instance, a proton in a cosmic ray moves at a speed of 2.8 x 10⁸ m/s and while doing so generates a force of 5 x 10^-12 N. How much power does the proton generate while a part of a cosmic ray?

The potential energy of a capacitor is found with the following equation U=¹/₂CV² which mimics the equation for kinetic energy KE=¹/₂mv². If the capacitor in an AED has a capacitance (C) of 100 μF and produces a voltage (V) of 3000 V while delivering a shock to a patient how much energy must the capacitor store?

An MRI can be modeled as a large current carrying solenoid. A typical MRI can produce a 3 Tesla magnetic field (B) and has a turn density of 8000 loops of wire per meter (n). What current is needed to produce this magnetic field? (B=μnI and μ is equal to 4πx10^-7 T/amp m)

To determine the energy of a photon you can use the equation E=hf, where h is Planck’s constant (6.63 x 10^-34 m² kg/s) and f is the frequency of the photon. If a photon has a frequency of 800 x 10⁶ Hz how much energy does that photon carry?