Mn is a transition element and can form several ions. Its ionic charge in MnF3 must be ______________
Fill in the blank(s) with correct word
3+
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Which of the following statements about thermal radiation is always true?
A) A hot object emits more x-rays than a cool object. B) A hot object emits more radio waves than a cool object. C) A hot object emits more total radiation than a cool object. D) A hot object emits more total radiation per unit surface area than a cool object. E) A hot object emits less total radiation than a cool object.
An AC voltage source has an amplitude of 96. V and frequency 400. Hz. The voltage was zero at t = 0 and was increasing
(a) What is the effective rms voltage? (b) What is the instantaneous voltage at 1.00 ms? (c) When will the voltage be 40. V?
A 200-kg spacecraft is launched to the Moon. After it has landed on the Moon, its weight is ________.
A. zero B. 200 kg C. about 1/6 its weight on Earth D. The answer depends on which side of the Moon the spacecraft landed on.
A parallel-plate capacitor with plate separation of 1.0 cm has square plates, each with an area of 6.0 × 10-2 m2
What is the capacitance of this capacitor if a dielectric material with a dielectric constant of 2.4 is placed between the plates, completely filling them? (?0 = 8.85 × 10-12 C2/N ? m2) A) 1.3 × 10-10 F B) 1.3 × 10-12 F C) 15 × 10-14 F D) 64 × 10-14 F E) 15 × 10-12 F