A 50 kg ice skater moving at 6 m/s collides with a second stationary skater with mass 70 kg. The skaters cling together after the collision and move without friction. Compute their speed after the collision
2.5 m/s
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The tension in a string from which a 4.0-kg object is suspended in an elevator is equal to 44 N. What is the acceleration of the elevator?
a. 11 m/s2 upward b. 1.2 m/s2 upward c. 1.2 m/s2 downward d. 10 m/s2 upward e. 2.4 m/s2 downward
A string with a mass per length of 2.00 gm/m is stretched with a force of 120 N between two points that are 0.400 m apart. The fundamental frequency of the stretched string is in tune with the fundamental frequency of an organ pipe filled with air and open at both ends. The velocity of sound in air at 0
is 331 m/s. What is the length of the organ pipe?
A. 54.1 cm B. 59.0 cm C. 61.5 cm D. 63.5 cm E. 66.8 cm
In a collision between two objects of unequal mass, which object receives a greater magnitude impulse?
A) the object of larger mass B) the object of smaller mass C) They receive equal magnitude impulses.
If ice at -40°C is added to water at +40°C, what final temperature will result?
1.It must be below 0°C. 2.It must be 0°C. 3.It must be above 0°C. 4.It can be below 0°C, 0°C, or above 0°C.