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A girl forgets to put on her glasses and finds that she needs to hold a book 12 cm from her eyes in order to clearly see the print.
(a) If she were to hold the book 58 cm away, what type of corrective lens would she need to use to clearly see the print?
(b) What is the focal length of the lens?
A 45.8-kg girl is standing on a 161-kg plank. Both originally at rest on a frozen lake that constitutes a frictionless, flat surface. What is the velocity of the plank relative to the ice surface
What happens in the table as to the potential energies
A mass M of a liquid at a temperature T1 is mixed with an equal mass of the same liquid at a temperature of T2. The system is thermally insulated. If C is themperature-independent specific heat of that liquid
In a dream, you find yourself pushing a huge boulder up a verysteep (35 degree) hill that is 75 meters high. The boulder weighs22,000 N. Assume that the force needed on flat ground is zero.
responding to an alarm an 88.4 kg fireman slides down a pole to the ground floor 4.60 m below. the fireman startsat
A string weed trimmer utilizes a length of nylon string thatrotates about an axis perpendicular to one end of the string. Thestring rotates at an angular speed of 47 rev/s, and its tip has atangential speed of 54 m/s. What is the length of the rot..
A steel ball with a mass of 32.0g is dropped from a height of 2.10m onto a horizontal steel slab. The ball rebounds to a height of 1.50m. find the average force on the ball during the impact
Suppose a single electron orbits about a nucleus containing two protons (+2e), Determine the magnitude of the electron's centripetal acceleration
A 5.00 x 10^4 kg space probe is travelling at a speed of 14000 m/s through deep space. Retrorockets are fired along the line of motion to decrease the probe's speed. The retrorockets generate a force of 4.00 x 10^5 N over a distance of 2600 km. What ..
A roller coaster is traveling along a vertical circular loop, How much work is done by the frictional force from Position 1 to Position 2
Which of the following statements is true for an elastic collision?
Two different elements with half lives Ta and Tb have Na & Nb (undecayed) atoms respectively, Determine the ratio of their activities at this instant
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