Physics Answers

An object of height 19.7 cm is placed 23.6 cm from a convex lens. What is the angular size of this object?

A violet ray of light leaves a first medium at an angle of 0.79 radians to the normal and enters a second medium at 0 56 radians to the normal. Given that the refractive index of the second medium is 1.33. What is the refractive index of the first medium?

If a trolley of mass 5kg moves at 4.m/s east across a frictionless horizontal surface and a box of mass 1,5 kg is dropped onto the trolley then the trolley and the box continues to move in the same direction.calculate the impulse of the trolley.

A machinist wishes to insert a brass rod with a diameter of 2 mm into a hole with a diameter of 1.995 mm. By how much would the machinist have to lower the temperature (in °C) of the rod to make it fit the hole?

A man pulls with a force of 300 N on a rope attached to a

building. The man is positioned 8 m away horizontally and 6

m at the base of the building (vertically) from the point of

attachment, A. What are the horizontal and vertical

components of the force exerted by the rope at point A?

1.The equivalent resistance of two resistors Ri and Rz connected in parallel is given Rey = If R, = 100.0 +5% and R = 47.0 + 5%, find the expected maximum and minimum value of their equivalent resistance when they are connected in parallel.

2. A particle moves in a straight line such that its displacement, x meters, from a fixed point on the line at time t seconds is given by x = 40[e-2t - e-4]. (a) Find the time when the particle is instantaneously at rest. (b) Find the displacement of the particle from O when t = 3 s. (c) Find the total distance travelled during the first 3 seconds of its

1.The equivalent resistance of two resistors Ri and Rz connected in parallel is given Rey = If R, = 100.0 +5% and R = 47.0 + 5%, find the expected maximum and minimum value of their equivalent resistance when they are connected in parallel.

2. A particle moves in a straight line such that its displacement, x meters, from a fixed point on the line at time t seconds is given by x = 40[e-2t - e-4]. (a) Find the time when the particle is instantaneously at rest. (b) Find the displacement of the particle from O when t = 3 s. (c) Find the total distance travelled during the first 3 seconds of its

Which one of the following is not a kinematic variable that appears in the equations of kinematics?

For the velocity potential function, ϕ = x ^ 2 - y ^ 2 find the velocity components at the point (4, 5)

The velocity potential function ϕ is given by ϕ = x2 - y^2. Find the velocity components in x and y direction. Also, show that ϕ represents a possible case of fluid flow.