Answer: a) 7.71 m/s², b) - 6.67 m/s²
Explanation: first thing to note is that
1 mile = 1609.34
1 hour = 3600s
Hence, 100mph to m/s = (100 × 1609.34)/3600 = 44.71 m/s
Initial velocity (u) = 0, final velocity (v) = 44.71 m/s, t = 5.8s, a = acceleration =?
By using newton's laws of motion
v = u + at
44.71 = 0 + a(5.8)
44.71 = 5.8a
a = 44.71/5.8
a = 7.71 m/s²
Question b)
The car is completing a stop which implies that the car is coming to rest, and when a car is coming to rest, the final velocity (v) is zero.
Hence u = 34 m/s, v = 0, a =?, t = 5.1 s
v = u + at
0 = 34 + a(5.1)
a(5.1) = - 34
a = - 34/5.1
a = - 6.67 m/s².
The negative sign beside the acceleration shows that the body is decelerating
The presence of mass makes gravity. Doesn't matter whether it's a planet, a black hole, a puppy, or a speck of dust.
Answer:
![q = 0.107 \mu C](https://tex.z-dn.net/?f=q%20%3D%200.107%20%5Cmu%20C)
Explanation:
As we know that net force is given by
![F = ma](https://tex.z-dn.net/?f=F%20%3D%20ma)
here we have
m = 1.00 g = 0.001 kg
also we know that acceleration is given as
![a = 256 m/s^2](https://tex.z-dn.net/?f=a%20%3D%20256%20m%2Fs%5E2)
now force is given as
![F = 0.001(256) = 0.256 N](https://tex.z-dn.net/?f=F%20%3D%200.001%28256%29%20%3D%200.256%20N)
now by the formula of force we know that
![F = \frac{kq_1q_2}{r^2}](https://tex.z-dn.net/?f=F%20%3D%20%5Cfrac%7Bkq_1q_2%7D%7Br%5E2%7D)
![0.256 = \frac{(9\times 10^9)q^2}{(0.02)^2}](https://tex.z-dn.net/?f=0.256%20%3D%20%5Cfrac%7B%289%5Ctimes%2010%5E9%29q%5E2%7D%7B%280.02%29%5E2%7D)
now for solving charge we have
![q = 0.107 \mu C](https://tex.z-dn.net/?f=q%20%3D%200.107%20%5Cmu%20C)
Answer:
Electronmagnetic waves: yes
Mechanical waves: no
Explanation:
Electromagnetic waves consist of electric fields and magnetic fields that oscillate perpendicularly to each other, and also in a plane perpendicular to the direction of propagation of the wave (therefore they are called "transverse waves".
As all waves, electromagnetic waves transport energy (but not matter). In particular, the type of energy transferred by electromagnetic waves is in the form of radiation, also called light energy.
Conversely, mechanical waves consist of oscillations of the particles in a medium. Mechanical waves also carries energy (but not matter), but not in the form of radiation (light energy): in fact, the energy is carried as vibrations of the particles in the medium, so it is a different type of energy.