Consider the following statement, and explain whether or not it is sensible: It will take me light-years to complete this homework assignment
What will be an ideal response?
This statement does not make sense because it uses the term light-year as a length of time, rather than as a distance.
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A rifle of slightly more mass, mr = 1.50 kg fires a bullet to the right, with speed 283 m/sec. The mass of the bullet is still mb = 0.025 kg. The size of the rifle's recoil momentum is _______ kg m/sec. Type in your answer to the nearest 0.1 kg m/sec of momentum. E.g., if your answer is 23.48 kg m/sec, then type in 23.5 for your answer.
i got 4.7 but that was wrong apparently.
Buoyancy: A polar bear of mass 200 kg stands on an ice floe that is a uniform 1.0 m thick. What is the minimum area of the floe that will just support the bear in saltwater of density 1030 kg/m3? The density of ice is 980 kg/m3.
A. 1.0 m2 B. 2.0 m2 C. 3.0 m2 D. 4.0 m2
A 6.00 kg mass is located at (2.00 m, 2.00 m, 2.00 m) and a 5.00 kg mass is located at (–1.0 m, 3.00 m,–2.00 m). If this system of masses rotated about the Z-axis perpendicular to the X-Y plane, then the moment of inertia of this system is
A. 60 kg 
B. 79 kg
C. 85 kg
D. 98 kg
E. 112 kg
What is a major problem with refracting telescopes?