Answer:
(c) 19.0s
Explanation:
Given Data
Car A speed v=22.0 m/s
Car B speed v=29.0 m/s
Car A distance S=300 m behind Car B
Car A acceleration a=2.40 m/s²
To find
Time required For Car A to take over Car B
Solution
We can represent Car A Coordinate by using equation of simple motion
And Coordinates of car B equals
Car A is overtake car B when:
Option (C) 19.0s is correct one
Explanation:
The given data is as follows.
Area (A) = 0.7 
.
Electric field between the plates, (E) = 55 N/C
Since, electric field is related to surface charge density as follows.
Also, E = 
or, 
Therefore, charge will be calculated as follows.
Q = 
= 
= 
= 341 pC
Thus, we can conclude that magnitude of the charge on each plate is 341 pC.
If the object is following a curve, or turning a corner, or slowing down, or speeding up, then it's motion is accelerated.
Answer:
Explanation:
Using conservation law of momentum
let m₁ = mass of the railroad, initial u₁ = 3.49 m/s
let m₂ = mass of one of the coupled car, u₂= 1.28m/s
let m₃ = mass of the second car u₃ = 1.28 m/s
m₁u₁ + m₂u₂ + m₃u₃ = v ( m₁ + m₂ + m₃)
since the masses are the same
m₁ = m₂ = m₃
m ( 3.49 + 1.28 + 1.28) = 3m v
6.05 m = 3 mv
v = 6.05 m / 3m = 2.0167 m/s
b) kinetic energy lost = energy before collision - energy after collision
= (0.5m₁u₁² + 0.5 ( m₁+m₂) u₂² - 0.5 ( m₁ + m₂ + m₃) v
= (6.58365 + 1.7712) - 6.5951 = 1.76J
A solid object is found to weigh 4.784.78n in air. when it is weighed while fully immersed in water, its apparent weight is 2.482.48n. 983 is the density of the object.
The substance's density is defined as its mass per unit of volume (volumetric mass density or specific mass). Although the Latin letter D may also be used, the symbol for density that is most usually used is (the lower case Greek letter rho). where V is the volume, is the density, and m is the mass. Weight per unit volume is a common informal definition of density, however this is incorrect scientifically; the actual term is specific weight. The US oil and gas industry serves as one illustration of this. A pure substance's mass concentration in numbers is equal to its density. To make density comparisons between different systems of units easier, it is occasionally replaced by the dimensionless quantity "relative density" or "specific gravity," which is the ratio of the density of the material to that of a standard material, usually water. If a substance's relative density to water is less than one, it will float in it. Temperature and pressure have an impact on a substance's density. This variation is frequently not very noticeable for solids and liquids, but it is very noticeable for gases. As pressure is applied, an object's density rises, which reduces the object's volume. With a few rare exceptions, as temperature increases, a substance's density decreases as its volume grows.
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