Question

Question 1 1 pts Dr. B is standing in an elevator, which is descending and getting slower at a rate of 1.70m/s2. Dr. B weighs 735N on Earth. What is the magnitude of the force the elevator floor exerts on Dr. B? Give your answer to 3 significant figures, in Newtons. Question 2 1 pts A box is released from rest at the top of a ramp. The surface of the ramp makes an angle of 22.6degrees with the horizontal, and is rough; the coefficients of friction between the ramp and the box are flg = 0.400 and Miks = 0.250. What is the magnitude of the acceleration of the box? Question 3

Answer 1

Giren, de acceleration of elevaton in a = 1.70 m/s2 weight of mg aat in the magnitude of force the elevaton floor Dr. B in W= = 735 N exerto on Dr. B. R-mg -R = m - ma mcato) ta mg + ma = 735 + 735 x 1.70 mg o - 735 + 735 X 1.70 :. 863 - R = 8 62.5 W 8 63 N N force in acted on Dr. B floor. by the elevator [ 22.6° 2) Given, o = 22.6° Ms = 0.400 MR=0.250 No=o. N = mg CASO. Itu MAN Etx=ma mg sino - MXN=ma sino - UK -9.8 sin 22.6° -0.250 x g. 8 cos 22.6° = 3.766 - 2.262 - 1.509 m/s2 -) ex ng cos Cuso ". The magnitude of acceleration in 1.504 m/s²