**Answer:**

The mass of silver that will occupy a volume of 87.75 mL is 920.5 grams.

**Explanation:**

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space. In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

So the density of silver is 10.49 g / mL indicates that 10.49 g occupies a volume of 1 mL. Then a rule of three can be applied in the following way: if in 1 mL a mass of 10.49 g is occupied, in 87.75 mL how much mass will it occupy?

mass= 920.5 g

<u><em>**
The mass of silver that will occupy a volume of 87.75 mL is 920.5 grams.**</em></u>

Mike enters a revolving door that is not moving. Mike should
push at the edge of the door where it is largest distance from the pivot point
in order to produce a torque with the least amount of force. Torque is equal to
t = force x distance.

**Velocity of car after 2mins is 36m/s**

**Distance travelled after 2mins is 2160m**

**Explanation:**

A car start from rest with acceleration a=0.3

Using equation of motion,

Velocity v is given by :

Distance d is given by

Velocity after time t=2mins=120s is

As car start from rest u=0

Therefore, Velocity of car after 2mins is **36m/s**

Distance travelled after 2mins=120s

As car start from rest u=0

Therefore, Distance travelled after 2mins is** 2160m**

**Answer:**

d = 7200 m

**Explanation:**

Given that,

Average speed of a runner, v = 2 m/s

Time taken by the runner, t = 60 min = 3600 s

We need to find the distance covered by the runner.

**Speed = distance divided by time taken.**

v = d/t

Putting all the values,

**So, the distance covered by the runner is 7200 m.**