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Questions in physics

[Answered] An object has a mass of 5 kg. What force is needed to accelerate it at [tex]$6 m / s ^2$[/tex]? (Formula: [tex]$F= ma$[/tex]) A. 0.83 N B. 1.2 N C. 11 N D. 30 N

[Answered] Newton developed a universal law of gravitation that can be used under most circumstances, not just for objects on the surface of the Earth. Here is the law: [tex]F=G \frac{m_1 m_2}{r^2}[/tex] where [tex]G[/tex] is a constant. Think about what happens when you increase and decrease each of the variables in Newton's equation for the gravitational force between two objects of mass [tex]m_1[/tex] and [tex]m_2[/tex], a distance [tex]r[/tex] from one another. Given your result, what is the likely cause of Kepler's observation that planets travel faster when they are closer to the Sun? Choose one: A. The force of gravity is weaker closer to the Sun. B. The mass of the Sun is greater when a planet is closer to it. C. The force of gravity is stronger closer to the Sun. D. The mass of the planet is greater when it is closer to the Sun.

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

[Answered] Which equation represents alpha decay? ${ }_{95}^{241} Am \rightarrow{ }_{93}^{237} Np+{ }_2^4 He$ ${ }_9^{18} F \rightarrow{ }_8^{18} O +{ }_1^0 e$ ${ }_6^{14} C \rightarrow{ }_7^{14} N+{ }_{-1}^0 e$ ${ }_{66}^{152} D y \rightarrow{ }_{66}^{152} D y+y

[Answered] Which value is closest to the mass of a 2-pound box of laundry detergent? A. $2.0 \times 10^{-4} cg$ B. 200 g C. 1 kg D. $9 \times 10^9 mg$ E. $4.5 \times 10^3 ng$

[Answered] Infrared waves are often called heat waves because they A. induce resonance of molecules in the skin that becomes thermal energy. B. are absorbed rather than reflected by the skin. C. emanate from relatively hot sources. D. are the predominant waves emitted by the Sun. E. consist of frequencies lower than those of visible light.

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

[Answered] The time rate of change of velocity is called what?

[Answered] (c) Two uniform line charges $[L _1]$ and $[L _2]$ of density $8.854 nC/m$ each located in space along the plane $Z =0$ at $y =+6$ and $y =-6 m$ respectively. At point $P (0,0,6)$, determine the: (i) electric field strength due to line 1 ; (ii) electric field strength due to line 2 ; (iii) total field strength.

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