A 0.50kg disk spins at 250rpm. A torque of 12.5Nm is applied for 0.150s to bring it to rest. What is the disk’s radius?
A. 0.54m
B. 0.38m
C. 0.29m
D. 0.14m
A. 0.54m
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A rectangular loop of wire carrying a 4.0-A current is placed in a magnetic field of 0.60 T
The magnitude of the torque acting on this wire when the plane of the loop makes a 30° angle with the field is measured to be 1.1 N ? m. What is the area of this loop? A) 0.20 m2 B) 0.40 m2 C) 0.26 m2 D) 0.80 m2 E) 0.53 m2
In a 400-m relay race the anchorman (the person who runs the last 100 m) for the Trojans can run 100 m in 9.8 s. His rival, the anchorman for the Bruins, can cover 100 m in 10.1 s
What is the largest lead the Bruin runner can have when the Trojan runner starts the final leg of the race, in order for the Trojan runner not to lose the race?
A car travels a distance of 100 km in 2.00 hours. It then travels an additional distance of 60.0 km in 1.00 hour. The average speed of the car for the entire trip is
A. 80.0 km/hr. B. 60.0 km/hr. C. 53.3 km/hr. D. 50.0 km/hr. E. 46.7 km/hr.
Which of these is correct?
A) a piece of solid iron floats in molten iron. B) a piece of solid aluminum floats in molten aluminum. C) a piece of ice floats in water. D) all the above E) none of the above