Please explain and show work. I\'m trying to figure out how to solve these probl

Question

Please explain and show work. I'm trying to figure out how to solve these problems given by my SI leader. Thank you.

5. A car goes around a flat curve with a radius of 65m. Ifthe car weighs 1500kg and the coefficient of friction is 0.77, what is the maximum speed the car can travels without slipping? 6. A washing machine with a radius of 65cm is spinning at 500RPM. A 60gm sweatshirt is stuck to the side while spinning. What is the normal force supplied by the walls of the washing machine? 7. A ball on a string is getting spun around above Don's head. If the ball weighs 30gm and the string makes a radius of .5m, what is the angular velocity of the ball if the Tension on the string is 45N?

Explanation / Answer

5) v = (usrg)0.5 = (0.77*65*9.8)^0.5 = 22.15 m/s

6) w = 500rpm = 500*2*pi/60 = 52.36 rad/s

tangential velocity = wr = 52.36*0.65= 34.03 m/s

Normal force = mv^2/r = 0.06*34.03^2/0.65 = 106.92 N

7) T = mv^2/r

45 = 0.03v^2/0.5

v = 54.77 m/s

w = v/r = 54.77/0.5 = 109.54 rad/s

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---