Momentum: A firecracker breaks up into two pieces, one of which has a mass of 200 g and flies off along the +x-axis with a speed of 82.0 m/s. The second piece has a mass of 300 g and flies off along the +y-axis with a speed of 45.0 m/s. What is the total momentum of the two pieces?
A. 361 kg ? m/s at 56.3° from the +x-axis
B. 93.5 kg ? m/s at 28.8° from the +x-axis
C. 21.2 kg ? m/s at 39.5° from the +x-axis
D. 361 kg ? m/s at 0.983° from the +x-axis
E. 21.2 kg ? m/s at 56.3° from the +x-axis
Answer: C
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Exhibit 7-1
Three 5.0-kg masses are located at points in the xy plane as shown in the figure.
?
?
Use this exhibit to answer the following question(s).
Refer to . What is the magnitude of the resultant force (caused by the other two masses) on the mass at x = 0.40 m, y = 0?
a.
2.2 × 10?8 N
b.
1.9 × 10?8 N
c.
1.4 × 10?8 N
d.
1.6 × 10?8 N
e.
2.5 × 10?8 N