Physics Answers

A solenoid 20 cm long of radius 2cm is wound uniformly with 3000 turns to wire.A current of 2 amp flows through the coil.

What is the solenoid current density

An electric heater is used to heat 0.5kg of water in a kettle of heat capacity 400j/k, kept at 20degrees celsius.

what mass of water is boiled away in 600s? (Neglect heat losses)

1.57 What is the maximum distance from which a sailor on top of the mast of ship 1, at 34 m above the ocean’s surface, can see another sailor on top of the mast of ship 2, at 26 m above the ocean’s surface?

This problem is too hard.

In the student's manual solutions there is 39km as an answer for this problem.

Please EXPLAIN to me why is the distance 39km.

I think the distance is close to 29km.

and

I got a different answer that the distance is 10km

Please provide me the answer.

THANK YOU VERY MUCH.

In your opinion, between Fiber Optic A and Fiber Optic B, which fiber has better construction. Explain the reasons.

Find the torque about the origin produced by a constant force of (6i+8j+10k) N on a particle situated at (3i-4k)m?

A motor exerts torque on a carousel for it to attain a speed of 2.5 rev/s starting from rest in 3.5 s. Find the work done by the motor if the carousel has a radius of 27 m and mass of 1.75 x10^5kg. Consider

the carousel to be a thin-walled cylinder rotating about its center.

Four identical spheres of masses 2.0 kg each and radius 0.25 m are situated at the four corners of a square. One side of the square measures 3.00 m. Find the moment of inertia about an axis (a) passing through the center of the square and perpendicular to its plane, (b) passing through one of the masses and perpendicular to its plane, (c) passing through two adjacent masses parallel to the plane, and (d) in the plane running diagonally through two meters.

2. Block 1 and block 2, with masses m1 = 5kg and m2 = 2kg, are connected by a system of massless, inextensible ropes and massless pulleys as shown in Fig. 2. (a) (Marks: 2) Draw the complete free body force diagram of the system. (b) (Marks: 4) Solve for the accelerations of block 2 and block 1. Assume that downward direction is positive. (c) (Marks: 2) Calculate the tensions in each rope

What is a thermodynamic state?

What is a thermodynamic process?

For 2.4 to 2.6, fill in the missing word.

2.4. A system can be taken from a given initial state to a given final state through____________ number of processes.

2.5. Heat may or may not be involved and in general work 𝑊 and heat 𝑄 will have ____________ values for different processes.

2.6. Therefore heat 𝑄 and work 𝑊 are path _____________ quantities.