When you walk forward on a scooter that was previously at rest, how do you calculate the total momentum of you and the scooter?
a. You don't have to calculate it; you already know that it is zero.
b. You measure how far you move forward and how far the scooter moves backward, and average the two.
c. You measure how far you move forward and how far the scooter moves forward, and add the two.
d. You calculate the forces on the scooter in newtons by adding mass and acceleration.
e. You calculate the forces on the scooter in newtons by multiplying mass and acceleration.
a
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A long solenoid (n = 1200 turns/m, radius = 2.0 cm) has a current of a 0.30 A in its winding. A long wire carrying a current of 20 A is parallel to and 1.0 cm from the axis of the solenoid. What is the magnitude of the resulting magnetic field at a point on the axis of the solenoid?
a. 0.60 mT b. 0.85 mT c. 52 ?T d. 0.40 mT e. 0.75 mT
Hard water is due primarily to dissolved salts of which elements?
a. Zinc and copper b. Calcium, iron, and magnesium c. Sodium and potassium d. Sodium and chlorine
An object with a rest mass of 0.456-kg is moving at 1.20 × 108 m/s. What is the magnitude of its momentum? (c = 3.00 × 108 m/s)
A) 5.57 × 107 kg ? m/s B) 5.67 × 107 kg ? m/s C) 5.97 × 107 kg ? m/s D) 5.47 × 107 kg ? m/s E) 5.87 × 107 kg ? m/s
Who proposed the cylindrical model of earth?
What will be an ideal response?