# Questions tagged [homework-and-exercises]

Applies to questions of primarily educational value - not only questions that arise from actual homework assignments, but any question where it is preferable to guide the asker to the answer rather than giving it away outright. Please READ THE GUIDANCE IN META before asking homework-like questions.

15,912 questions
Filter by
Sorted by
Tagged with
39 views

### Normal force in this example? [on hold]

My question here is, why there is no Normal Force, because object A is on the ground. Is it because the normal force only exist when we move object along some path?
87 views

### Angle between velocity and acceleration vector, and interpretation of pathway [closed]

I just started studying mechanics, and I am stuck with the following question: $$\vec{r}(t)=a \sin(\alpha t^2)\hat{x}+b \cos(\alpha t^2)\hat{y}$$ I was asked to find the formula that expresses the ...
64 views

30 views

### How much energy does it require to fuse a proton with a nucleus? [closed]

If calcium 45 is bombarded with protons and one proton is to be added to the nucleus of the atom, how much energy is required to overcome the electromagnetic force?
31 views

31 views

### Constant Pressure Cylinder

The solution to this states that "pressure of the gas is constant." What implies this? Is it because the piston was elevated then stopped? If the gas pushed the Piston all the way up to where it ...
30 views

### Calculating entropy change in this irreversible process

A 15.0-kg block of ice at 0.0°C melts to liquid water at 0.0°C inside a large room at 20.0°C. Treat the ice and the room as an isolated system, and assume that the room is large enough for its ...
65 views

20 views

### Motion of particle in uniform magnetic field with friction propositional to velocity [closed]

A positively charged particlewith charge "q" is at $(0,0,0)$.There is a uniform magnetic field $\vec B= -B \hat k$. The particle is given velocity $\vec u= u \hat i$. A resistive friction acts on ...
34 views

### How work interferes into law of conservation of energy problem?

A 10kg block slides down a hill that is 200m tall as shown in the figure below with an initial speed of 12m/sec. a) What is the speed of the block when it reaches the bottom of the hill at position ...
41 views

### Constrained Motion [closed]

There are two bodies viz. A and B which are placed on a horizontal surface. The free end P is being pulled by a constant force of 1 N. Find the acceleration of free end P? My approach Sign ...
33 views

### Effect on mass of change of angle on hinged beam

I am trying to calculate the change in weight (if any) on point B of a beam hinged at point A if the angle changes. e.g. A bridge hinged on solid ground (Point A) reaching onto a floating pontoon (...
22 views