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Questions in physics

[Answered] A particle is projected vertically upwards from its ground with an initial speed of [tex]$30 ms^{-1}$[/tex]. Calculate the: 1. Maximum height reached by the particle. 2. Time taken by the particle to return to the ground. 3. Time taken for the particle to attain a height of 4 m above its ground. Take g = [tex]$10 ms^{-2}$[/tex]

[Answered] Ana exerts a force of 20 N on a volleyball that has a mass of 0.15 kg. What is the force that the volleyball exerts on Ana? A. 0.15 N B. 20 N C. 19.85 N D. 20.15 N

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

[Answered] A car is moving at a constant speed along a straight line. Which statement is true about the forces acting on the car? A. The net force acting on the car from all directions is zero. B. The net force acting on the car is greater than the car's weight. C. The net force acting on the car is in the direction of the car's motion. D. The net force acting on the car is in the opposite direction of the car's motion.

[Answered] What is the mass of a crate if a force of 200 N causes it to accelerate at [tex]$8 m / s ^2$[/tex]? (Formula: [tex]$F= ma$[/tex])

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

[Answered] Which will a positively charged object attract? A. an object that has a negative charge B. an object that has a smaller positive charge C. an object that has no charge D. an object that has a larger positive charge

[Answered] In which direction does the electric field point at a position directly west of a negative charge? A. West B. East C. North D. South

[Answered] What is the electric force acting between two charges of 0.0072 C and -0.0060 C that are 0.0040 m apart? Use [tex]F_0=\frac{k q_1 q_2}{r^2}[/tex] and [tex]k =9.00 \times 10^9 N \cdot m ^2 / C ^2[/tex]. A. [tex]$-9.7 \times 10^7 N$[/tex] B. [tex]$2.4 \times 10^{-10} N$[/tex] C. [tex]$9.7 \times 10^7 N$[/tex] D. [tex]$-2.4 \times 10^{-10} N$[/tex]

[Answered] The table shows the masses of four objects. Object Mass (kg) Book 1.1 Rock 2.3 Box 4.5 Fish 5.8 Which object has a weight of about 22.5 N?