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A far-sighted student has a near point of 43.2 cm. Calculate the focal length of the glasses needed so the near point will be normal (25 cm). Answer in units of cm
Bob walks 320 south, then jogs 450southwest, then walks 320 in a direction 35east of north. Find the direction of the displacement that will return Bob to his starting point by the most direct route
An inductor has a 53.6-? reactance when connected to a 60.0-Hz source. What is the maximum current in the inductor
A classmate throws a 1.3-kg book from a height of 1.2 m above the ground straight up into the air. Determine the velocity of the book just before hitting the ground
A uniform drawbridge must be held at a 35.0?angle above the horizontal to allow ships to pass underneath. what is the initial angular acceleration of the bridge
A 10. kg blocks rests on a table (on Earth) and 0.50 is the coefficient of static friction. what is the maximum horizontal pull that will not move the block
find the potential difference across the capacitor. A conductor consists of a circular loop of radius R and two straight, long sections. The wire lies in the plane of the paper and carries a current I.
By measuring the spectrum of wavelengths of light from our sun, we know that its surface temperature is 5760 K . By measuring the rate at which we receive its energy on earth, we know that it is radiating a total of 3.93×1026 J/s and behaves nearl..
A gymnast performing a routine on the high bar feels weightless at the highest point of their rotation. Why does the gymnast feel weightless at the highest point of their rotation around the bar? What is the cause of this phenomenon
A copper wire with a cross sectional area of 3.00 mm^2 and a length of 2.00 m at 20.0 degrees C is connected to a 25.0 V battery, what is the resistance at 20.0 degrees C
An inductor used in a dc power supply has an inductance of 12.0H and a resistance of 170 OMEGA . It carries a current of 0.300 A. What is the energy stored in the magnetic field
A positive charge +q1 is located to the left of a negative charge -q2. On a line passing though the two charges, What is the distance between the charges
The tune-up specifications of a car call for the spark plugs to be tightened to a torque of 48Nm. With what force must you pull
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