Should be D bcs i took this same exact test yesterday
Answer:
The repulsive electrostatic force between two of the protons is 14.4 N.
Explanation:
Given;
distance between the two protons, r = 4 x 10⁻¹⁵ m
charge of a proton, q = + 1.6 x 10⁻¹⁹ C
The repulsive electrostatic force between two of the protons is calculated by applying Coulomb's law;
![F = \frac{k q_1 q_2 }{r^2} \\\\where;\\k \ is \ Coulomb's \ constant = 9\times 10^9 \ Nm^2/C^2 \\\\F = \frac{9\times 10^9 \ (1.6\times 10^{-19})^2}{(4 \times 10^{-15})^2} \\\\F = 14.4 \ N](https://tex.z-dn.net/?f=F%20%3D%20%5Cfrac%7Bk%20q_1%20q_2%20%7D%7Br%5E2%7D%20%5C%5C%5C%5Cwhere%3B%5C%5Ck%20%5C%20is%20%5C%20Coulomb%27s%20%5C%20constant%20%3D%209%5Ctimes%2010%5E9%20%5C%20Nm%5E2%2FC%5E2%20%5C%5C%5C%5CF%20%3D%20%5Cfrac%7B9%5Ctimes%2010%5E9%20%5C%20%20%281.6%5Ctimes%2010%5E%7B-19%7D%29%5E2%7D%7B%284%20%5Ctimes%2010%5E%7B-15%7D%29%5E2%7D%20%5C%5C%5C%5CF%20%3D%2014.4%20%5C%20N)
Therefore, the repulsive electrostatic force between two of the protons is 14.4 N.
Explanation:
An electric motor is a device that uses an electromagnet to change electrical energy to kinetic energy. When current flows through the motor, the electromagnet rotates, causing a shaft to rotate as well. The rotating shaft moves other parts of the device
Answer:
B
Explanation:
Technological advancements in astronomy have led to the development of thousands of products such as
new materials, medical devices, and communications satellites.
For example, the production of instruments like telescopes, microscopes, and other measuring devices now enables us to identify things that we couldn't examine with the naked eye.
Similarly, the development of communication satellites has led to the emergence and improvements in the mobile network industry.
Let's first convert the initial and final speed of the vehicle in m/s:
![v_i = 0km/h = 0m/s](https://tex.z-dn.net/?f=v_i%20%3D%200km%2Fh%20%3D%200m%2Fs)
![v_f = 60km/h \cdot \frac{1000 m/km}{3600 s/h} =16.67 m/s](https://tex.z-dn.net/?f=v_f%20%3D%2060km%2Fh%20%5Ccdot%20%20%5Cfrac%7B1000%20m%2Fkm%7D%7B3600%20s%2Fh%7D%20%3D16.67%20m%2Fs)
Therefore, the acceleration of the car is given by
![a= \frac{v_f-v_i}{t}= \frac{16.67 m/s-0 m/s}{20 s}=0.83 m/s^2](https://tex.z-dn.net/?f=a%3D%20%5Cfrac%7Bv_f-v_i%7D%7Bt%7D%3D%20%5Cfrac%7B16.67%20m%2Fs-0%20m%2Fs%7D%7B20%20s%7D%3D0.83%20m%2Fs%5E2%20%20)
And so now we can calculate the force required by using Newton's second law: