The answer is "positive" because a vector can be represented by an arrow. An arrow or "vector" can be denoted by drawing the size of the arrow in proportion to the magnitude of the vector. The positive and negative are designated for direction...

Good luck -Abi :)

8 0

3 years ago

A model rocket has a mass of 0.435kg. It is mounted vertically and launches directly up with a thrust force of 13.1N.

EleoNora [17]

Answer:

17.27N

Explanation:

Given

m = 0.435kg

F = 13.1N

Unknown:

Weight or W

Formula and solution

W = F = mg

W = (0.435kg)(9.8m/s^2)

W = 4.26N + 13.1N

Final answer

W = 17.27N

4 0

3 years ago

A hair dryer draws 14.5 a when plugged into a 120-v line. assume direct current.

AVprozaik [17]

Missing part in the exercise. Complete text:
"A hair dryer draws 14.5 A when plugged into a 120-V line. Assume direct current.

(a) What is its resistance? Express your answer to two significant figures and include the appropriate units."

(b) How much charge passes through it in 11 min ? Express your answer to two significant figures and include the appropriate units.

Solution

(a) We can calculate the resistance by using Ohm's law:

$\Delta V= I R$

Since we know that $\Delta V=120 V$ and $I=14.5 A$ , we can find R:

$R= \frac{\Delta V}{I} = \frac{120 V}{14.5 A}=8.3 \Omega$

(b) The current is equal to the quantity of charge by unit of time:

$I= \frac{Q}{t}$

In our problem, t=11min=660 s, so we can calculate the charge passed through the hair dryer:

$Q=It=14.5 A \cdot 660 s = 9570 C$

5 0

3 years ago

Cara menghitung daya dorong

Arlecino [84]

Thrust adalah kekuatan atau dorongan. Ketika sistem mendorong atau mempercepat massa dalam satu arah, ada dorong (force) hanya besar dalam arah yang berlawanan. Dalam matematika dan fisika, ini dijelaskan oleh hukum kedua dan ketiga Isaac Newton. Dorong digunakan untuk menggambarkan seberapa baik jenis mesin berjalan. Hal ini dapat digunakan untuk berbagai jenis mesin seperti mesin roket, pesawat (baling-baling) mesin, dan mesin jet.
Thrust diukur dalam "pon dorong" di AS dan di Newton dalam sistem metrik. 4.45 Newton dorong sama dengan 1 pon dorong. Satu pon dorong adalah berapa banyak dorong yang dibutuhkan untuk menjaga satu pon objek tak bergerak melawan gaya gravitasi di bumi.

7 0

4 years ago