A box of unknown mass accelerates 0.5 m/s2 when a force 0f 50 N is exerted on it. What force is needed to cause the box accelerate at 8m/s2?

Which types of electromagnetic waves have higher frequencies than the waves that make up ultraviolet light? check all that apply. radio waves infrared light microwaves gamma rays visible light x-rays

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?