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Questions in physics

[Done] When all parts of a circuit are composed of conducting materials, the circuit is said to be A) parallel. B) shorted. C) closed. D) open.

[Done] Which statement explains how weight is different from mass? A. Mass is a varying property. B. Mass is measured in newtons. C. Weight is always greater than mass. D. Weight is a measure of gravitational pull.

[Done] A sphere of radius [tex]$r$[/tex] is moving at speed [tex]$v$[/tex] through air of density [tex]$\rho$[/tex]. The resistive force [tex]$F$[/tex] acting on the sphere is given by the expression [tex]$F=B r^2 \rho v^k$[/tex] where [tex]$B$[/tex] and [tex]$k$[/tex] are constants without units. i. State the SI base units of [tex]$F, \rho$[/tex] and [tex]$v$[/tex]. ii. Use base units to determine the value of [tex]$k$[/tex].

[Done] How does work affect energy between objects so it can cause a change in the form of energy? A. Work transfers energy. B. Work changes energy. C. Work increases energy. D. Work decreases energy

[Done] The image shows a wave diagram with the following information: - The wave travels a distance of 20 cm. - The time period is 12 seconds. Calculate the wave velocity in m/s.

[Done] Viscosity is a measure of how easily a liquid will flow. True False

[Done] Which of the following is considered to be a vector? A. Velocity B. Time C. Temperature D. Mass

[Done] According to Newton's Second Law of Motion, what is the formula to calculate force? a. [tex]$F=\frac{m}{a}$[/tex] b. [tex]$F=m a$[/tex] c. [tex]$F=\frac{a}{m}$[/tex] d. [tex]$F=m+a$[/tex]

[Done] How much energy is required to raise the temperature of 3 kg of iron from [tex]$20^{\circ}$[/tex] C to [tex]$25^{\circ} C$[/tex]? Use the table below and this equation: [tex]Q=m c \Delta T$[/tex]. | Substance | Specific Heat Capacity ([tex]$J /( g \cdot{ }^{\circ} C )$[/tex] ) | | :---------- | :---------------------------------------------------- | | Liquid water | 4.186 | | Ice | 2.11 | | Air | 1.00 | | Aluminum | 0.897 | | Soil | 0.80 | | Granite | 0.790 | | Iron | 0.450 | | Copper | 0.385 | | Silver | 0.233 | | Lead | 0.129 | A. 13.50 J B. 6750 J C. 1350 J D. 2.25 J

[Done] Which force dominated the universe during the Big Bang? Select your answer. (A) Nuclear force (B) Magnetic force (C) Centripetal force (D) Gravitational force