Answer:
Acceleration, ![a=-1.5\ m/s^2](https://tex.z-dn.net/?f=a%3D-1.5%5C%20m%2Fs%5E2)
Explanation:
It is given that,
Initial velocity of the car, u = 10 m/s (in right)
Final velocity of the car, v = -5 m/s (in left)
Time taken, t = 10 s
Let a is the acceleration of the car. It can be calculated using the equation of kinematics. The equation is as :
![v=u+at](https://tex.z-dn.net/?f=v%3Du%2Bat)
![a=\dfrac{v-u}{t}](https://tex.z-dn.net/?f=a%3D%5Cdfrac%7Bv-u%7D%7Bt%7D)
![a=-1.5\ m/s^2](https://tex.z-dn.net/?f=a%3D-1.5%5C%20m%2Fs%5E2)
So, the acceleration of the car is
. Hence, this is the required solution.
Answer:
increased by a factor of 4
Explanation:
Answer:
As light from a star races through our atmosphere, it bounces and bumps through the different layers, bending the light before you see it. Since the hot and cold layers of air keep moving, the bending of the light changes too, which causes the star's appearance to wobble or twinkle.
It is made like the reflect in presence of magnetism. It gets deflected on earth towards north also because of a huge magnetism of earth.
Answer:
the angle must decrease to maintain balance and that the system remains motionless
Explanation:
In a system of a block in an inclined plane, using Newton's second law
X Axis Wₓ-fr = 0
Y Axis N -
= 0
The equation for the force of friction is
fr = μ N
And using trigonometry for weight components
sin θ = Wₓ / W
cos θ = W_{y}/ W
Wₓ = W sin θ
W_{y} = W cos θ
We replace
Wₓ = fr
W sin θ = μ Wcos θ
tan θ = μ
If the coefficient of friction decreases the force of static friction decreases, ₓso the value of the tangent must decrease so the angle must decrease to maintain balance and that the system remains motionless or with constant speed