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Q. An anchor shoots an arrow with a velocity of 45 m/s at an angle of 50 degrees with the horizontal.An assistant standing on the level ground 150 m downrange from the launch point throws an apple straight up into the air at th right time and speed for it to be hit by the arrow.(a)What is the minimum initial speed of the apple? (b)how long after the arrow launch should the apple be thrown at this minimum speed so that arrow hits the apple? (c)if the apple instead is thrown 40 m/s ,at what times ,relative to the arrow launch ,could thrown? (d)if the arrow hits the apple after both were launched at the same time ,what is the apple's velocity at the time of impact?
A 2.20 sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward sound receiver as heart beats. The reflected sound is after that mixed with the transmitted so..
Starting from rest, a 40 kg body reaches a speed of 8.0m/s in 2s. Calculate the force acting on the body?
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A person weighs 670N steps onto a spring scale in the bathroom, and the spring compresses by 0.79 cm. What is the spring constant? And what is the weight of another person who compresses the spring by 0.34 cm.
The two upper front teeth of a person exert a total force of 30N on a piece of steak. If the biting edge of each tooth measures 10 mm x 1 mm, find out the pressure on the steak.
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