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A person is nearsighted and can clearly focus on objects that are no farther than 2.6 m away from her eyes. She borrows a friend's glasses but the borrowed glasses make things worse; that is, the person can now focus only on objects that are within 1.85 m away. What is the focal length of the borrowed glasses? please show your work
Tension is maintained in a string. The observed wave speed is 25 m/s when the suspended mass is 3.0 kg. (a) What is the mass per unit length of the string?
What focal length does the lens need. how many meters will the car have moved before it begins to slow down.
A submarine is 304 m horizontally out from the shore and 126 m beneath the surface of the water. A laser beam is sent from the sub so that it strikes the surface of the water at a point 232 m from the shore. If beam just strikes the top of a building..
A boat has a mass of 5220 kg. Its engines generate a drive force of 4480 N due west, What is the boat's acceleration
A large punch bowl holds 3.00kg of lemonade (which is essentially water) at 25.0C. A 5.80×10^?2kg- ice cube at -10.0C is placed in the lemonade a)What is the final temperature of the system? Ignore any heat exchange with the bowl or the surroundin..
The meter stick in the drawing can rotate about an axis located at the 20.0-cm mark, Which force, F1 or F2, acts on the meter stick, and what is its magnitude
A 6 m long 50 kg ladder leaning on a frictionless wall can successfully be scaled by a 120 kg man. find the minimum angle between the ladder and the floor
A nuclear power plant produces an average of 4.90 × 103 MW of power during a year of operation. Find the corresponding change in mass of reactor fuel
A vertical spring of spring constant 140N/m supports a mass of 80g. The mass oscillates in a tube of liquid. Estimate the damping constant b
A 2.0 kg object moving with a velocity of +6.0 m/s collides with a 6.0 kg object that is initially at rest. Find the energy lost in the collision.
A child's toy consists of a piece of plastic attached to a spring, estimate the force constant of the spring
A horizontal force of magnitude 34.5 N pushes a block of mass 4.09 kg across a floor where the coefficient of kinetic friction is 0.609. During that displacement, the thermal energy of the block increases by 39.3 J. What is the increase in thermal ..
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