Physics Answers

On a part-time job, you are asked to bring a cylindrical iron rod (RD = 7.8) of length 85.8 cm and diameter 2.85 cm from a storage room to a machinist. A) Calculate the mass of the rod expressed in kilogram. B) Will you need a cart?

A 0.2kg is drag 0.5m upward with a uniform velocity along a plane inclined 30° with the horizontal by a force parallel to the incline. The coefficient of kinetic friction between the object and the plane is 0.25. How much work is done by the applied force? Show complete solution.

A 500 MW steam power plant consumes coal at a rate of 65 tons/h. If the heating value of the coal is 30,000 kJ/kg, what is the overall efficiency of this plant? 

A steam power plant burns coal to produce a 600 MW net power with an overall thermal efficiency of 45 percent. The actual air-fuel ratio in the furnace is calculated to be 12 kg air/kg fuel. The heating value of the coal is 30,000 kJ/kg. 

(i)  What is the rate and amount of coal consumed during a 24-hour period?

(ii) What is the rate of air flowing through the furnace? 

Suppose that a force F=250 N applied at 20° below the horizontal is just enough to start the motion of the 55 kg crate in Sample Problems 3.5 item 3. Find the (a) normal force and (b) coefficient of static friction. please explain it by step-by-step with explanation THANK YOUUU

There are two cans of food are sitting on a kitchen counter. The same pressure is exerted on the table by each of the weights of the cans; however the cans are not identical and the densities of the contents are not identical. The radius of can 1 is r₁ = 0.045 m and the radius of can 2 is r₂ = 0.025 m. The density of can 1 is ρ₁ = 810 kg/m³, the density of can 2 is ρ₂ = 980 kg/m³, and the height of can 1 is h₁ = 0.18 m. 

What is the acceleration of a 45kg block at rest pushed by a 280N horizontal force up to 30degree inclined planw with a roughness coefficient of 0.15

A 45kg block ar rest was pushed by a 280N horizontal force up a 30degree inclined plane with a roughness coefficient of 0.15, what is the netforce acting on the block

There are three (3) cars moving differently with respect to the earth. Suppose that Car A is moving 20km/h

20km/h to the east, Car B is moving 8km/h

8km/h to the east, while Car C is moving 5km/h

5km/h to the west.

a. What is the velocity of Car A with respect to Car B?

b. What is the velocity of Car C with respect to Car B?

Joey and his friends are pushing a piece of driftwood which they will be using in their landscaping project. They pushed the wood by applying the following forces:

Joey: 5 N, north

Friend 1: 2.2 N, west

Friend 2: 3.86 N, 55° north of west

What is the net force applied by Jerry and his friends on the wood?