If you see an object rotating, is there necessarily a net nonzero torque acting on it?
1.yes.
2.only if it is rotating with a constant angular speed
3.No, a net nonzero torque would not cause an object to rotate.
4.only if the object's angular speed changes
4
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Answer the following statement(s) true (T) or false (F)
1. The magnitude of the normal force on a box sitting on an incline is equal to that of its weight.
2. Putting wider tires on your car will clearly give you more traction
3. Assume that the coefficient of static friction between your car’s tires and a certain road surface is about 0.75. Your car can climb a 45° slope.
4. We can express the kinetic friction law in the form 
5. A car with four-wheel drive can climb a steeper slope than a car with two-wheel drive.
A stretched string can have ______________ natural frequency(ies)
a. one b. 10 times its length in c. 5 times its length in d. many
How does the seven year cycle of weather compare to the yearly seasonal cycle with regards to the change in the earth’s temperature?
What will be an ideal response?
An inventor develops a stationary cycling device by which an individual, while pedaling, can convert all of the energy expended into heat for warming water. What minimum power must be generated if 300 g of water (enough for 1 cup of coffee) is to be heated in 10 min from 30°C to 90°C? (1 cal = 4.186 J, the specific heat of water is 4 186 J/kg • °C)
a. 9400 W c. 160 W b. 590 W d. 130 W