What is the critical angle for diamond (n = 2.42)?
A. 2.42 
B. 67.5
C. 65.6
D. 24.4
E. 37.1
D. 24.4
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Daisy (50. kg mass) skates on ice at 4.0 m/s to greet her friend (70. kg mass), who is standing still, with open arms. As they collide, while holding each other, with what speed do they both move off together?
A) 2.5 m/s B) 1.7 m/s C) zero D) 5.0 m/s
Work done within an isolated system can increase the energy of the system
Indicate whether the statement is true or false
A block lies on a horizontal frictionless surface. A horizontal force of 100 N is applied to the block giving rise to an acceleration of 3 m/s2. (a) Determine the mass of the block
(b) Calculate the distance the block will travel is the force is applied for 10 s. (c) Calculate the speed of the block after the force has been applied for 10 s.
Consider the displacement vectors shown below.
a) Which vector (if any) is equal to 
?
(b) Which is not equal to but has the same magnitude?
(c) Which is equal to 
?
(d) Which is equal to 
?