Awashing machine uses 1.8 × 105 watts of power. if it is in use for 2 hours per day (on average), how many kilowatt hours will it use in 30 days?
a. 1,100 kilowatt hours
b. 36 kilowatt hours
c. 18 kilowatt hours
d. 540 kilowatt hours
e. 1.1 × 106 kilowatt hours

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

Your science teacher brings in a speaker to talk to your class about climate change. during the session, students ask a few questions. which questions are related to the current evidence on climate change