The figure below shows a planet traveling in a counterclockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
A. its speed is constant.
B. its speed is increasing.
C. its speed is decreasing.
D. its speed is a maximum.
E. its speed is a minimum.
Answer: E
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Flux: A rectangular loop of wire that can rotate about an axis through its center is placed between the poles of a magnet in a magnetic field with a strength of 0.40 T, as shown in the figure. The length of the loop L is 0.16 m and its width w is 0.040 m. What is the magnetic flux through the loop when the plane of the loop is perpendicular to the magnetic field?
A. 13 × 10-3 T ? m2 B. 2.6 × 103 T ? m2 C. 0.80 T ? m2 D. 2.6 × 10-3 T ? m2 E. 0 T ? m2
Cometary impacts with Jupiter
A) are impossible to observe from Earth. B) are spectacular but do not teach us much. C) have been observed from Earth at least twice. D) are extremely rare. E) would not be catastrophic if they happened on Earth.
Thermal Expansion: A large vat contains 1.000 L of water at 20°C. What volume will this water occupy when it is heated up to 80°C? Water has a volume expansion coefficient of 210 × 10-6 K-1.
A. 1.600 L B. 1.013 L C. 0.987 L D. 0.9987 L
Can you identify a physical situation when the partial derivatives from the left and right are not the same?
What will be an ideal response?