Answer:
a) pressure means force acted on a body per unit area
<u>Answer</u>:
Speed = 3.33 m/s
<u>Explanation</u>:
Formula:
Speed = distance / time
<em>Here distance is 800 metres and time is 240 seconds</em>
<em>Using the formula:</em>
Speed = 800 / 240
Speed = 3.33 m/s
It will take 20 seconds for the car to attain a speed of 34 m/s
Explanation:
- Acceleration of an object is given by a = velocity/time.
- Here, acceleration of the car = 1.7 m/s² and velocity = 34 m/s. Using these, find time.
- Time = velocity/acceleration
= 34/1.7 = 20 s
So it takes 20 seconds to attain a speed of 34 m/s
Initial volume of water is 155 mL. Convert the mass of iron and lead into volume using density values as follows:
d=\frac{m}{V}
Here, d is density, m is mass and V is volume of objects
volume of piece of iron can be calculated as:
V=\frac{m}{d}=\frac{15 g}{7.86 g/mL}=1.90 mL
Similarly, volume of lead can be calculated as:
V=\frac{m}{d}=\frac{20 g}{11.3g/mL}=1.77 mL
To calculate the final volume of water, volume of both iron and lead should be added to the initial volume of water.
V_{final}=V_{initial}+V_{iron}+V_{lead}=155 mL+1.90 mL+1.77mL=158.67 mL
Thus, new water level in milliliters will be 158.67 mL.