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Eratosthenes measured the circumference of the Earth by noting that the Sun is at an angle of 7°12' = 7.2° ("one-fiftieth of a circle") south of the vertical in Alexandria at the same time of day and year that it is directly overhead in Syene. Syene is 5000 stades directly south of Alexandria. (The stade was a Mediterranean unit of length that varied slightly from region to region, but in Egypt was most likely equal to 157.5 meters.) Find the circumference of the Earth from these data. The Earth's equitorial circumference is 40075 km according to NASA. What was Eratosthenes percent error?
The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. Evaluate how far does he slide?
The left ventricle of the heart accelerates blood from rest to a velocity of + 20.3 cm/s. How much time does blood take to reach its final velocity
A uniform circular metal disk has radius 36 cm and mass 350 g and its center is at the origin. Then a circular hole of radius 9 cm is cut out of it. What is the total linear acceleration of a piece metal at the disk's outer edge
A firecracker in a coconut blows the coconut into three pieces. Two pieces of equal mass fly off south and west, What is the speed of the third piece
What is moment of inertia
A coin 2.1 cm in diameter is held 25 cm from a concave spherical mirror of 28 cm radius of curvature. What is the diameter of the image
At the instant the traffic light turns green, a car that has been waiting at an intersection starts forward with a constant acceleration of 2.45 m/s2. How fast is the car traveling when it overtakes the truck
A parallel capacitor has plates 2.0cm x 3.0cm. The plates are separated by a 1.0mm thick piece of paper. Find the capacitance of this device
A ball thrown horizontally at 28 m/s travels a horizontal distance of 55 m before hitting the ground. From what height was the ball thrown
A 850-kg sports car accelerates from rest to 95 km/h in 7.0s, What is the average power delivered by the engine
Converting sunlight to electricity with solar cells has an efficiency of 15%. What is the theoretical maximum efficiency
A 3.00 kg block of wood sits on a table. A 3.00 g bullet, fired horizontally at a speed of 550 m/s, goes completely through the block, emerging at the speed of 190 m/s. What is the speed of the block immediately after bullet exits.
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