What kind of friction exists between solid objects moving in water?

You and your lab partner are asked to determine the density of an aluminum bar. the mass is known accurately (to four significan

larisa [96]

The given data is tabulated below

Measurement Method A Method B
-------------------- -------------- --------------
1 2.2 2.703
2 2.3 2.701
3 2.7 2.705
4 2.4 5.811

A graph of the data reveals that 5.811 from measurement B is an outlier, and should be rejected.

Part a: Calculate average density.
Method A:
Avg. density = (2.2+2.3+2.7+2.4)/4 = 2.4 g/cm³
Method B:
Avg. density = (2.703+2.701+2.705)/3 = 2.703 g/cm³

Answer:
Average densities are
2.4 g/cm³ by method A
2.703 g/cm³ by method B, with the outlier removed.

Part b: Calculate the percent error.
The true value is 2.702 g/cm³
Method A:
%error = 100*(|2.4 - 2.702|/2.702) = 11.2%
Method B:
%error = 100*(|2.703 - 2.702|/2.702) = 0.04%

Answer:
The percent error is
11.2 by method A,
0.04% by method B.

Part c:
Method B is more accurate and more precise because its average value is closest to the true value and its %error is extremely small.

3 0

4 years ago

A speedboat is moving at a constant speed, and the force propelling it forward is balanced by the force of the water pulling it

Kipish [7]

The correct answer is C: the speedboat's direction of motion will change. This is In fact, the new force of 500 N from the side of the boat is not balanced by any forces from the other side, and therefore this force will cause an acceleration in the direction of the force itself, which is not the same direction of motion. Therefore, the speedboat will acquire a movement on the lateral direction as well.

6 0

3 years ago

Read 2 more answers

a 91.5 kg football player running east at 3.73 m/s tackles a 63.5 kg player running east at 3.09 m/s. what is their velocity aft

Lesechka [4]

The final velocity is 3.47 m/s east

Explanation:

We can solve this problem by using the law of conservation of momentum. In fact, the total momentum of the two players before and after the collision must be conserved:

$p_i = p_f\\m_1 u_1 + m_2 u_2 = (m_1+m_2)v$

where:

$m_1 = 91.5 kg$ is the mass of the first player

$u_1 = 3.73 m/s$ is the initial velocity of the first player (we take east as positive direction)

$m_2 = 63.5 kg$ is the mass of the second player

$u_2 = 3.09 m/s$ is the initial velocity of the second player

$v$ is their final combined velocity after the collision

Re-arranging the equation and substituting the values, we find:

$v = \frac{m_1 u_1+m_2 u_2}{m_1+m_2}=\frac{(91.5)(3.73)+(63.5)(3.09)}{91.5+63.5}=3.47 m/s$

So, their velocity afterwards is 3.47 m/s east.

Learn more about momentum:

brainly.com/question/7973509

brainly.com/question/6573742

brainly.com/question/2370982

brainly.com/question/9484203

#LearnwithBrainly

6 0

3 years ago

“A famous person to themselves, they don't get up in the morning and think, I'm famous. I'm not famous to me. Famous is a percep

Fynjy0 [20]

I would say B because different people see famous people in different ways. like a famous person would just see them self as a person whereas a non-famous person would see them as amazing and superior to others.

8 0

4 years ago

Read 2 more answers

Max is a network technician who just terminated the ends on a new copper cable used between two legacy switches. When he connect

Olegator [25]

Answer:

The cable used is a straight through cable.

Explanation:

The cable used here is a straight through cable, that is why it fails to establish the connection.

Cross-over cables are used to communicate over legacy switch. It is used to connect computing devices directly.

In a cross over cable, signal gets transmit from one end of the device to the other.

7 0

3 years ago