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Questions in physics

[Answered] The radiosonde can be used to measure upper air temperature. Please select the best answer from the choices provided. A. True B. False

[Answered] If an object has a mass of 20 kg, what's the force of gravity acting on it on Earth? A. 2.04 kg B. 196 N C. 32.67 N D. 1.96 kg

[Answered] Calculate the coefficient of coupling between two coils, given that the mutual inductance (M) is 1.5 H and the self inductances are 5 H and 4 H.

[Answered] True or False: Friction can be reduced by lubricating or changing the shape of objects.

[Answered] D. solid foam. 8. A fire on an elevated object such as a wall or billboard is best attacked with A. roll-on B. rain-down C. bank-down/bounce-off D. drop down 9. Which element of the fire tetrahedron is not affected by a blanket of foam? A. Fuel

[Answered] Which procedure could a student use to examine an intensive property of a rectangular block of wood? A. Find the mass. B. Record the length. C. Measure the volume. D. Determine the density.

[Answered] Two parallel rectangular plates measuring 80 mm by 12 cm are separated by 4 mm of mica and carry an electric charge of 0.48 MC. The voltage between the plates is [tex]$500 V$[/tex]. Calculate: (a) The electric flux density. (b) The electric field strength. (c) The capacitance of the capacitor, in picofarads, if the relative permittivity of mica is 5.

[Answered] When a spring is compressed, the energy changes from kinetic to potential. Which best describes what is causing this change? A. work B. power C. gravitational energy D. chemical energy

[Answered] An object has a mass of 13.5 kilograms. What force is required to accelerate it to a rate of [tex]$9.5 m / s ^2$[/tex]? A. 173.75 N B. 128.25 N C. 132.30 N D. 81.00 N

[Answered] Observable matter makes up about what percentage of the universe? A. 5% B. 10% C. 50% D. 95%