31. Three objects are connected on a table as shown in Fig. QIC
ure P5.31. The coefficient of kinetic friction between the
block of mass m, and the table is 0.350. The objects have
masses of m, = 4.00 kg, m, = 1.00 kg, and m2 = 2.00 kg, and
the pulleys are frictionless. (a) Draw a free-body diagram of
each object. (b) Determine the acceleration of each object,
including its direction. (c) Determine the tensions in the two
cords. What If? (d) If the tabletop were smooth, would the
tensions increase, decrease, or remain the same? Explain.
ma
mi
m3

An electric current is flowing through the cord below.what will happen to this current if a magnet is brought near the cord? a. the electric current will stop flowing. b. it will exert a force on the voltage. c. the resistance of the wire will decrease. d. it will exert a force on the electric current.

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?

Which of these is constant for all types of electromagnetic radiation in a vacuum? select one: a. wavelength b. frequency c. photon energy d. amplitude e. velocity