A ball is oscillating on an ideal spring with an amplitude of 8.3 cm and a period of 4.6 s. Write an expression for its position, x, as a function of time t, if x is equal to 8.3 cm at t = 0.0 s. Use the cosine function
What will be an ideal response?
x = (8.3 cm) cos[2?t/(4.6 s)] or x = (8.3 cm) cos[(1.4 s-1)t]
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Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s. Their dog, Spot, starts from Arthur's side at the same time and runs back and forth between them
By the time Arthur and Betty meet, what is Spot's displacement?
Ammonia is mixed with water in a ratio of 1 part ammonia to 4 parts water (by volume) and used as a cleaning agent for floors. Estimate the evaporation rate of the ammonia per unit area if the process occurs at 25ºC. Assume air is moving over the surface at 5 m/s.
What will be an ideal response?
A spaceship, traveling at 0.560c towards a stationary space platform, launches a secondary towards the station with a speed of 0.100c relative to the spaceship
What is the speed of the secondary rocket relative to the space platform? A) 0.460c B) 0.575c C) 0.600c D) 0.625c E) 0.660c
A machinist turns on the power on to a grinding wheel at time t = 0 s. The wheel accelerates uniformly from rest for 10 s and reaches the operating angular speed of The wheel is run at that angular velocity for 40 s and then power is shut off
The wheel slows down uniformly at until the wheel stops. For how long a time after the power is shut off does it take the wheel to stop? A) 64 s B) 62 s C) 66 s D) 68 s E) 70 s