Give one example of friction making something stay still ?

svetoff [14.1K]

To see if the project is actually going to work. Also called prototypes

6 0

3 years ago

A doubly ionized molecule (i.e., a molecule lacking two electrons) moving in a magnetic field experiences a magnetic force of 5.

Kobotan [32]

Explanation:

The given data is as follows.

F = $5.75 \times 10^{-16} N$

q = $1.6 \times 10^{-19} C$

v = 385 m/s

$sin (63.9^{o})$ = 0.876

Now, we will calculate the magnitude of magnetic field as follows.

B = $\frac{F}{qv sin (\theta)}$

= $\frac{5.75 \times 10^{-16} N}{1.6 \times 10^{-19} C \times 385 m/s \times 0.876}$

= $0.01065 \times 10^{3}$ T

= 10.65 T

Thus, we can conclude that magnitude of the magnetic field is 10.65 T.

4 0

3 years ago

Which of the following metals reacts with oxygen and acids but is not very reactive with water?

Lina20 [59]

Calcium is reactive with oxygen, acid, and water. Copper is not reactive with water as well as with acids, whereas magnesium is reactive with acid but reactive with water.

<h3>What is a Chemical Reaction?</h3>

One or more chemicals (the reactants) are changed into one or more other compounds during a chemical reaction (the products).Substances are made up of chemical components or chemical elements.

Each calcium atom donates a pair of electrons to an oxygen atom during the interaction between calcium and oxygen to create calcium oxide.

When calcium reacts with hydrochloric acid, it releases bubbles of hydrogen gas, and when large chunks of calcium react with hydrochloric acid, it releases hydrogen gas. Calcium in reaction with water produces calcium hydroxide and hydrogen gas

When magnesium and oxygen interact, they produce light that is so strong that it temporarily impairs your vision. Magnesium burns so brilliantly because it produces a lot of heat while doing so.

Magnesium reacts with hot water or water vapor to produce hydrogen gas and magnesium hydroxide.

Acid does not react with copper. Metals such as lead, copper, silver, and gold do not react with water at all.

To get more info about the chemical reaction:

brainly.com/question/3461108

#SPJ1

7 0

2 years ago

Numerical Problems

Evgesh-ka [11]

Answer:

a = 5 [m/s²]

Explanation:

To solve this problem we must use the following equation of kinematics.

$v_{f}=v_{o}+a*t$

where:

Vf = final velocity = 20 [m/s]

Vo = initial velocity = 10 [m/s]

t = time = 2 [s]

a = acceleration [m/s²]

Now replacing:

$20 =10 +a*2\\10=2*a\\a=5[m/s^{2} ]$

4 0

3 years ago

An aircraft is at a standstill. It accelerates to 140kts in 28 seconds. The aircraft weighs 28,000 lbs. How many feet of runway

stiv31 [10]

Answer:

runway use is 3307.8 feet

Explanation:

given data

velocity = 140 kts = 140 × 0.5144 m/s = 72.016 m/s

time = 28 seconds

weight = 28000 lbs

to find out

How many feet of runway was used

solution

we will use here first equation of motion for find acceleration

v = u + at ..............1

here v is velocity given and u is initial velocity that is 0 and a is acceleration and t is time

put here value in equation 1

72.016 = 0 + a(28)

a = 2.572 m/s²

and

now apply third equation of motion

s = ut + 0.5×a×t² .......................2

here s is distance and u is initial speed and t is time and a is acceleration

put here all value in equation 2

s = 0 + 0.5×2.572×28²

s = 1008.24 m = 3307.8 ft

so runway use is 3307.8 feet

5 0

4 years ago