During a lunar eclipse, the Moon, Earth, and Sun all lie on the same line, with the Earth between the Moon and the Sun
The Moon has a mass of 7.36 × 1022 kg; the Earth has a mass of 5.98 × 1024 kg; and the Sun has a mass of 1.99 × 1030 kg. The separation between the Moon and the Earth is given by 3.84 × 108 m; the separation between the Earth and the Sun is given by 1.496 × 1011 m.
(a) Calculate the force exerted on the Earth by the Moon.
(b) Calculate the force exerted on the Earth by the Sun.
(c) Calculate the net force exerted on the Earth by the Moon and the Sun.
(a) 1.99 × 1020 N, toward the Moon
(b) 3.55 × 1022 N, toward the Sun
(c) 3.53 × 1022 N, toward the Sun
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A beam of x-rays at a certain wavelength are scattered from a free electron that is at rest, and the scattered beam is observed at 45.0° from the incident beam
What is the change in the wavelength of the x-rays during this process? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 1.75 × 10-13 m B) 2.76 × 10-13 m C) 0 m D) 3.56 × 10-13 m E) 7.10 × 10-13 m
The scalar product is not distributive
Indicate whether the statement is true or false
It is said that electric charge is conserved, which means that electric charge
A) may occur in an infinite variety of quantities. B) is a whole number multiple of the charge of one electron. C) will interact with neighboring electric charges. D) can be neither created nor destroyed. E) is sometimes negative.
A race car travels 40 m/s around a banked (45° with the horizontal) circular (radius = 0.20 km) track. What is the magnitude of the resultant force on the 80-kg driver of this car?
a. 0.68 kN b. 0.64 kN c. 0.72 kN d. 0.76 kN e. 0.52 kN