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The average life of a 100-watt lightbulb is stated on the package to be 750 hours. The quality control director at the plant making the lightbulbs needs to check whether the statement is correct. The director is only concerned about a possible reduction in quality and will stop the production process only if statistical evidence exists to conclude that the average life of a lightbulb is under 750 hours. A random sample of 20 bulbs is collected and left on until they burn out. The lifetime of each bulb is recorded. The data are (in hours of continuous use) 738, 752, 710, 701, 689, 779, 650, 541, 902, 700, 488, 555, 870, 609, 745, 712, 881, 599, 659, 793. Should the process be stopped and corrected? Explain why or why not.
A 69-kg lumberjack stands at one end of a 409-kg floating log, as shown in the figure. Both the log and the lumberjack are at rest initially. calculate the lumberjacks speed relative to the shore
if you plot a best-fit line for data on a graph of position vs. time, what units does the lines (vertical) intercept have
A 45 kg block of ice slides down a frictionless incline 1.5 m long and 0.91 m high. A worker pushes up against the ice, parallel to the incline, find the magnitude of the worker's force
An ice hockey puck is sliding along the vertical wall as shown on the picture (top view shown). Puck is moving in the horizontal plane only. Find the velocity of the puck at that point
A mass is oscillating on a spring with a period of 4.6s. At t=0s the mass has zero speed and its x = 8.3 cm. What is the acceleration at t=2.5s
A loaded grocery cart is rolling across a parking lot in a strong wind. How much work does the force you apply do on the grocery cart
The upward normal force exerted by the floor is 610 N on an elevator passenger who weighs 660 N. What is the reaction force to weight of the passenger
A merry-go-round is a common piece of playground equipment. What is the merry-go-round's angular velocity, in rpm, after John jumps on
An electron moving with a speed of 6.0×10^5 m/s in the positive direction experiences zero magnetic force. Find the components of the magnetic field
The human eye can barely detect a star whose intensity at the earth's surface is 1.6 x 10-11 W/m2. find how many photons per second enter the eye from the star
Two equally charged particles are held 2.610-3 m apart and then released from rest.The initial acceleration of the first particle is observed to be7.0 m/s2 and that of the secondto be 10.0 m/s2. The mass ofthe first particle is 6.3 10-7 kg.
Suppose L1 has a focal length of -5 cm. This is in direct contact with a second lens named L2. If an object is placed 5 cm from the lens combination, the resulting magnification is seen to be M=-10. Find the focal length of the second lens in ..
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