A point on the rim of a 0.30-m-radius rotating wheel has a tangential speed of 5.0 m/s. What is the tangential speed of a point 0.20 m from the center of the same wheel?
a. 1.0 m/s
b. 0.50 m/s
c. 3.3 m/s
d. 17 m/s
c
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A 100-N little physics tyke hangs on the ends of a rope suspended over a pulley as shown. The tension in the rope is
1) 0 N. 2) 50 N. 3) 100 N. 4) 200 N. It is interesting to note that 5) the tension in the rope at its midpoint (uppermost part) is 100 N. 6) this is a modified tug-o'-war example (simply draped over a pulley). 7) the net force acting on the rope is in this case identical to the child's weight.
Answer the following statement(s) true (T) or false (F)
One can convert work to heat (the reverse of what a heat engine does) with perfect efficiency.
Four long wires are perpendicular to the x-y plane. Each wire carries the same magnitude current. Wire 1 goes through point (a, a, 0) on the x-y plane, wire 2 goes through the point (–a, a, 0), wire 3 goes through the point (–a, –a, 0), and wire 4 goes through the point (a, –a, 0). Wires 1 and 2 carry their currents in the positive z direction and wires 3 and 4 carry their currents in the
–z direction. What is the direction of the resulting magnetic field at the origin? a. the –x direction b. the –y direction c. the +x direction d. There is no direction since the field is zero at this position.
You drive 6.00 km at 50.0 km/h and then another 6.00 km at 90.0 km/h. Your average speed over the 12.0 km drive will be
A) greater than 70.0 km/h. B) equal to 70.0 km/h. C) less than 70.0 km/h. D) exactly 38.0 km/h. E) cannot be determined from the information given, must also know directions traveled