Florence who weighs 480N, stands on a bathroom scale in an elevator. what will s
ID: 1469574 • Letter: F
Question
Florence who weighs 480N, stands on a bathroom scale in an elevator. what will she see the scale read when the elevator is accelerating upward at 4.0 m/s/s? A 5-kgram ball is loaded into a 100-kg homemade cannon. the cannon is at rest when it is ignited. immediately after the impulse of the explosion, a photogate timer measures the cannon to recoil backwards with avelocity of 10m/s . Determine the post-explosion speed of the tennis ball V=_____ m/s.tcnp/blackboard kean.edu Take Test: Test #2 Extra Credit Test Infamation Fence QUE STION
Explanation / Answer
1)
w =480 N, a =4m/s^2, g =9.8 m/s^2
w =mg =480
m =480/9.8 =48.98 kg
Apparent weight =T
T -mg =ma
T = m (a+g) = 48.98(9.8+4)
the scale reading is T = 675.92 N
2) m = 5kg, M =100 kg, vc =10 m/s
From conservation of momentum
m*ub +M*uc = m*vb +M*vc
m*ub = M*vc
Velocity of tennis ball ub = (100*10)/5 =200 m/s
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