Aforce vec f =f x hat i +f y hat j acts on a particle that undergoes a displacement of vec s =s x hat i +s y hat j where f x =7 n , f y =-3 n , s x =4 m , and s y =1 m . find the work done by the force on the particle . answer in units of j.

What is the relationship between the wavelength of a wave and it's energy?

What is the most useful equation for electric power?

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.