Answer:
Driver hits the dog
Explanation:
From kinematics equation
and making a the subject
![a=\frac {v_f^{2}-v_i^{2}}{2s}=\frac {0-20^{2}}{2*50}=-4m/s^{2}](https://tex.z-dn.net/?f=a%3D%5Cfrac%20%7Bv_f%5E%7B2%7D-v_i%5E%7B2%7D%7D%7B2s%7D%3D%5Cfrac%20%7B0-20%5E%7B2%7D%7D%7B2%2A50%7D%3D-4m%2Fs%5E%7B2%7D)
F=ma=800*-4=-3200 N
The driver is required to apply a force of 3200 N to effectively not hit the dog. However, when the driver applies 2000 N, this is less the required force by 1200 N hence the driver hits the dog.
Answer:
a vacuum formed above the column of mercury in a mercury barometer.
Answer:
(a) 4.27 x 10^-4 Telsa
(b) 3.28 x 10^-4 Telsa
Explanation:
side of square, a = 5.49 cm
inner radius, r = 18.1 cm = 0.181 m
number of turns,N = 450
current, i = 0.859 A
(a)
The magnetic field due to a solenoid due to inner radius is
![B = \frac{\mu_{0}Ni}{2\pi r_{inner}}](https://tex.z-dn.net/?f=B%20%3D%20%5Cfrac%7B%5Cmu_%7B0%7DNi%7D%7B2%5Cpi%20r_%7Binner%7D%7D)
![B = \frac{4\pi\times 10^{-7}\times 450\times 0.859}{2\pi \times 0.181}](https://tex.z-dn.net/?f=B%20%3D%20%5Cfrac%7B4%5Cpi%5Ctimes%2010%5E%7B-7%7D%5Ctimes%20450%5Ctimes%200.859%7D%7B2%5Cpi%20%5Ctimes%200.181%7D)
B = 4.27 x 10^-4 Telsa
(b)
The outer radius is R = 18.1 + 5.49 = 23.59 cm = 0.236 m
The magnetic field due to the outer radius is
![B = \frac{\mu_{0}Ni}{2\pi r_{outer}}](https://tex.z-dn.net/?f=B%20%3D%20%5Cfrac%7B%5Cmu_%7B0%7DNi%7D%7B2%5Cpi%20r_%7Bouter%7D%7D)
![B = \frac{4\pi\times 10^{-7}\times 450\times 0.859}{2\pi \times 0.236}](https://tex.z-dn.net/?f=B%20%3D%20%5Cfrac%7B4%5Cpi%5Ctimes%2010%5E%7B-7%7D%5Ctimes%20450%5Ctimes%200.859%7D%7B2%5Cpi%20%5Ctimes%200.236%7D)
B = 3.28 x 10^-4 Tesla
The force exerted by student A with his scooter is 306 N and that of student B is 204 N.
<h3>
Force applied by each student</h3>
The force exerted by each student is calculated from Newton's second law of motion.
F = ma
where;
- m is mass
- a is acceleration
F(A) = 127.5 x 2.4
F(A) = 306 N
F(B) = 120 x 1.7
F(B) = 204 N
Thus, the force exerted by student A with his scooter is 306 N and that of student B is 204 N.
Learn more about force here: brainly.com/question/12970081
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