Classify the following statement as a characteristic
(a) of electric forces only,
(b) of magnetic forces only,
(c) of both electric and magnetic forces, or
(d) of neither electric nor magnetic forces.
The force exerted on a moving charged object is zero.
1.electric forces
2.magnetic forces
3.both electric and magnetic forces
4.neither electric nor magnetic forces
4
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A toy rocket that weighs 10 N blasts straight up from ground level with an initial kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J
To what vertical height above the ground does it rise, assuming no air resistance? A) 10 m B) 24 m C) 1.0 m D) 14 m
A 10.0-kg rod has a varying linear density that is symmetric about the midpoint of the rod. The moment of inertia about an axis perpendicular to the rod that passes through the rod 30.0 cm from its midpoint is 5.00 kg?m2
What is the moment of inertia about an axis perpendicular to the rod that passes through the rod 20.0 cm from its midpoint? A) 7.50 kg?m2 B) 4.50 kg?m2 C) 5.10 kg?m2 D) 4.90 kg?m2 E) Answer depends on whether the new axis is on the same side of the midpoint as the 30.0 cm distant axis or if its on the opposite side of the midpoint.
A "galactic fountain" is _____
a. a stream of gas and dust being pulled into a galaxy as it forms b. a jet of high-speed superheated material thrown out of the accretion disk around a black hole c. a partial spiral arm formed by the collision of molecular clouds d. a bubble of hot, metal-rich gas ejected from the disk by a burst of supernova e. a stream of gas made from a star that has been torn apart while falling into a supermassive black hole
Which of the following is NOT true about adding comment features to a website?
A. Do not require users to create an account before posting comments. B. Comments help a website creator gauge interest in a post or article. C. To add a comments feature, you can add a premade script to your website code. D. Spam often appears in comments.