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Questions in physics

[Free] A box with a mass of 7 kilograms is pushed up a ramp to a height of 5 meters. What is the work done against the force of gravity? Assume the ramp has negligible friction. A. 3.4 x 10² joules B. 6.9 x 10² joules C. 8.6 x 10² joules D. 1.7 x 10² joules

[Free] [tex]\beta[/tex] - decay producing ${ }_{39}^{90} Y$

[Free] The forward voltage drop across a silicon diode is about: a. 2.5 V b. 3 V c. 10 V d. 0.7 V

[Free] 12. A 9V battery maintains a current of 3 A through a radio. What is the resistance in the circuit? 13. Describe the function of a diode in your own words.

[Free] The table shows information about four objects resting at the top of a hill. Four Objects at Rest on a Hill | Object | Mass $(kg)$ | Potential energy $(J)$ | |---|---|---| | W | 50 | 980 | | X | 35 | 1,029 | | Y | 62 | 1,519 | | Z | 24 | 1,176 | Which object is on the tallest hill?

[Free] The radius of the Earth's orbit around the Sun is 1.50 × 10¹¹ m. The Earth takes 3.15 × 10⁷ s to complete the orbit. What is the mass of the Sun? [G = 6.67 × 10⁻¹¹ N m² kg⁻²]

[Free] Suppose a particle travels along the x-axis from (-14m, 0) to (15m, 0), and then to (-8m, 0) in 20 seconds. a) Find the total distance travelled and displacement of the particle. b) Calculate the average speed and average velocity.

[Free] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Free] If voltage in a circuit is constant, the current can be cut to half of its original value by changing the resistance to its original value. Which best completes the statement? A. one-fourth B. one-half C. two times D. four times

[Free] A train travels from city A to city B. It leaves A at 10:30 AM and arrives at B at 1:15 PM. The distance between the cities is 142 miles. What was the average speed of the train in miles per hour (mph)? For example, if the average speed is 50 mph, simply enter 50. The average speed is ______ miles per hour.