BIO Effect on Blood of Walking. While a person is walking, his arms swing through approximately a 45° angle in 1 2 s. As a reasonable approximation, assume that the arm moves with constant speed during each swing. A typical arm is 70.0 cm long, measured from the shoulder joint. (a) What is the acceleration of a 1.0-g drop of blood in the fingertips at the bottom of the swing? (b) Draw a free-body diagram of the drop of blood in part (a). (c) Find the force that the blood vessel must exert on the drop of blood in part (a). Which way does this force point? (d) What force would the blood vessel exert if the arm were not swinging?
BIO Effect on Blood of Walking. While a person is walking, his arms swing through approximately a 45° angle in 1 2 s. As a reasonable approximation, assume that the arm moves with constant speed during each swing. A typical arm is 70.0 cm long, measured from the shoulder joint. (a) What is the acceleration of a 1.0-g drop of blood in the fingertips at the bottom of the swing? (b) Draw a free-body diagram of the drop of blood in part (a). (c) Find the force that the blood vessel must exert on the drop of blood in part (a). Which way does this force point? (d) What force would the blood vessel exert if the arm were not swinging?
BIO Effect on Blood of Walking. While a person is walking, his arms swing through approximately a 45° angle in
1
2
s. As a reasonable approximation, assume that the arm moves with constant speed during each swing. A typical arm is 70.0 cm long, measured from the shoulder joint. (a) What is the acceleration of a 1.0-g drop of blood in the fingertips at the bottom of the swing? (b) Draw a free-body diagram of the drop of blood in part (a). (c) Find the force that the blood vessel must exert on the drop of blood in part (a). Which way does this force point? (d) What force would the blood vessel exert if the arm were not swinging?
In shot putting, many athletes elect to launch the shot at an angle that is smaller than the theoretical one (about 42) at which the distance of a projected ball at the same speed and height is greatest. One reason has to do with the speed the athlete can give the shot during the acceleration phase of the throw. Assume that a 7.260 kg shot is accelerated along a straight path of length 1.650 m by a constant applied force of magnitude 380.0 N, starting with an initial speed of 2.500 m/s (due to the athlete’s preliminary motion).What is the shot’s speed at the end of the acceleration phase if the angle between the path and the horizontal is (a) 30.00 and (b) 42.00? (Hint: Treat the motion as though it were along a ramp at the given angle.) (c) By what percent is the launch speed decreased if the athlete increases the angle from 30.00 to 42.00?
A block with mass mAmAm_A = 11.0 kgkg on a smooth horizontal surface is connected by a thin cord that passes over a pulley to a second block with mass mBmBm_B = 6.0 kgkg which hangs vertically. (Figure 1)
A.) Determine the magnitude of the acceleration of the system.
Express your answer to two significant figures and include the appropriate units.
A=_________ ____________
B.) If initially mAmA is at rest 1.250 mm from the edge of the table, how long does it take to reach the edge of the table if the system is allowed to move freely?
Express your answer to two significant figures and include the appropriate units.
T= ___________ ___________
C.) If mBmB= 1.0 kgkg, how large must mAmAbe if the acceleration of the system is to be kept at g100g100?
Express your answer to two significant figures and include the appropriate units.
MA= ___________ __________
According to a simplified model of a mammalian heart, at each pulse, approximately 20 g of blood is accelerated from 0.26 m/s to 0.35 m/s during a period of 0.10 s.
What is the magnitude of the force exerted by the heart muscle?
Express your answer to two significant figures and include the appropriate units.
F= ______ units
I got 0.02N but it is wrong.
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