Sign up to access problem solutions.

Already have an account? Log in here.

Physics is not a discipline, but a way of looking at the world. See if you can use your sense of the world to explain everyday phenomena.

**in km/hr**?

Sign up to access problem solutions.

Already have an account? Log in here.

The average human heart pumps \(5~\mbox{L/min}\) of blood through the human body at a pressure of \(10^4~\mbox{Pa}\). For a person who lives 80 years, what is the total energy output of his heart **in Joules**?

**Details and assumptions**

- Assume that the cardiac output is constant for any age.
- There are 365.25 days in one year, and 24 hours in a day.

Sign up to access problem solutions.

Already have an account? Log in here.

Josh makes a cup of coffee at a station that is a few minutes walk from his lab. The coffee is piping hot when it fills the cup and he pours soy creamer into the coffee at some point before he drinks it. The creamer is kept in the refrigerator and is much colder than the coffee.

If Josh wants the coffee to be as hot as possible when he gets back to the lab, at what point should he add the creamer to the coffee?

Sign up to access problem solutions.

Already have an account? Log in here.

One of the most lethal NERF guns is the Strongarm, a 6 shooter revolver known for its rapid fire. The firing mechanism is straightforward, a spring is used to drive air through a cylinder which then forces the dart out of the barrel.

Its popularity is due in part to the ease with which it can be modified to shoot faster and farther. One easy modification is to insert a secondary spring inside the main spring, as shown below:

If the strength of the first spring is \(k\), and the strength of the second spring is \(\frac12 k\), what is the strength of the two springs together?

Sign up to access problem solutions.

Already have an account? Log in here.

Sign up to access problem solutions.

Already have an account? Log in here.

×

Problem Loading...

Note Loading...

Set Loading...