Which element is magnetic?
Answer
cobalt
Protons have a positive charge which is indicated by a + sign.
Hence, the answer is C.
Answer:
A. A car can still be moving without acceleration when it has some velocity.
B. A car can come to a stop when moving itself when it has some de acceleration.
C.A ca can start at 0 m/s and speed up to 15 m/s when it has some acceleration.
Explanation:
A. since the car has no acceleration the velocity of the car would help it moving.
B. when the car is moving with some velocity but coming to a stop this is possible of and only if it has some de acceleration
C. since the speed of the car increases from 0 to 15 m/s acceleration is involved. If the speed was constant there would be no acceleration involved.
Answer:
θ = 68.9º
Explanation:
The equation that governs the process of light passing through a polarizer is described by Malus's law
I = I₀ cos² θ
Where I is the transmitted intensity, I₀ is the incident intensity and TE is the angle between the light and the polarizer
If i is 0.13I₀, we substitute in the equation
0.13 Io = I₀ cos² θ
Cos² θ = 0.13
Cos θ = √ 0.13
θ = cos⁻¹ (0.36056)
θ = 68.9º
Answer:
51.96 m/s^-1
Explanation:
a) see the attachment
b) As we know the velocity of the projectile has two component, horizontal velocity v_ox. and vertical velocity v_oy as shown in the figure. At the highest point of the trajectory, the projectile has only horizontal velocity and vertical velocity is zero. Therefore at the highest point of the trajectory, the velocity of the projectile will be
v_ox=v_o*cosФ
=60*cos (30)
= 51.96 m/s^-1