What is the unit of wavelength?

A

hertz

B.

metre

С

metre per second

D

second

А

B

С

D

**Answer:**

A wavelength is a measure of distance between two consecutive crests or trough. So , the unit of wavelength is same as unit of distance. I.e metre

pls help asap pls explain. Just before opening her parachute a skydiver having a mass of 50 kg reaches terminal velocity. Calculate the force of air resistance if the buoyant force is 20 N. Be careful! Use the skydiver’s mass to calculate his/her Fg (force of gravity).

**Answer:**

490N

**Explanation:**

Given that,

Mass of a skydiver, m = 50 kg

Buoyant force = 20 N

When the skydiver reaches the terminal velocity, net force on her is equal to 0. So, air drag is equal to the weight of the skydiver.

D = mg

Putting all the values,

D = 50 × 9.8

D = 490 N

So, the force of air resistance is 490 N.

what would a boats velocity be if it would go 15kph and 18 kph?

**Answer:**

It depends

**Explanation:**

Can an object have a positive position, but a negative velocity? Explain your reasoning.

**Answer:**

Yes

**Explanation:**

A position describes the position of an object relative to the x/y-axis (or the four cardinal directions). A velocity is a vector quantity, defining speed with direction.

So if an object is in a positive position, it means they are in the positive x-axis direction (or wherever on the scale the positive values are stated to be) and if it has a negative velocity, it means said object is moving in the opposite direction of the positive x-axis. It is possible for the object to still be in the positive position as it's moving with a negative velocity

define fundamental units

**Answer:**

one of a set of unrelated units of measurement, which are arbitrarily defined and from which other units are derived. For example, in the SI system the fundamental units are the meter, kilogram, and second.

**Explanation:**

HELP GIVING BRAINLIEST

**Answer:**

16: x4

17 x2

18; 4.5 for q1 and 4.5 for q2

**Explanation:**

In which box could “gas” be placed?

*C. W is not the answer

It is U:move freely,and spread out

в горизонтальном положении бревно длиной 18 м можно уравновесить на подставке, отстоящей на 3 м от его толстого конца. Если же подставка находится в 6 м от толстого конца, и на тонкий конец сядет рабочий массой 60 кг, то бревно снова будет в равновесии. Определите массу бревна.

Ответ:

90кг

Пояснение:

Найдите эскиз прилагаемой схемы. Масса бревна M размещается на отметке 3 см от толстого конца, а стержень размещается на отметке 6 см от массы бревна.

Согласно принципу момента, сумма момента по часовой стрелке равна сумме момента против часовой стрелки.

Вес корпуса в более тонкой части W = мг

W = 60 × 10 = 600 Н

Момент по часовой стрелке = 600 × 9

CW момент = 5400 Нм

Момент против часовой стрелки = M × 6

Момент ACW = 6M

Уравнять оба момента

6M = 5400

М = 5400/6

М = 900Н

Масса бревна = 900/10

Масса бревна = 90кг

what is a unit of electrical flow called

**Answer:**

AMPERE - A unit of measure for the flow of current in a circuit. One ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance. The ampere is used to measure electricity much as "gallons per minute" is used to measure water flow.

**Explanation:**

hope it helps

A unit of electrical flow is known as ampere

60 point!!!

Instructions-

Give a real life example of each of Newton's Laws in action. Be sure to specificy which law your

example is linked to.

Give examples with pulleys

**Answer:**

Playing hockey, driving a car, and even simply taking a walk are all everyday examples of Newton's laws of motion.

what are two different examples of positive exeleration

**Answer:Accelerating your car to get up to speed on a freeway
**

**An airplane accelerating to take off
**

**Accelerating out of the starting blocks at a track meet**

**Explanation:**

What is the kinetic Energy of the 80 kg skydiver if he is falling at 60 m/sec?

KE = 1/2 x 80 x 60^2

KE = 144000

KE = 144000

**Answer:**

144000J

**Explanation:**

Ek=1/2mv²

Ek=1/2×80×60²

Ek=144000J

What type of glass is heat resistant?

A.leaded glass

B.tinted glass

C.borosilicate glass

D.tempered glass

**Answer:**

D.

**Explanation:**

Tempered glass is the less expensive alternative, and is best for lower temperature applications. It can withstand constant temperatures of up to 470 degrees F. Tempered glass is regular glass that has been strengthened through a thermal or chemical treatment. Tempering not only strengthens the glass but also changes its breakage pattern, causing it to shatter into small pieces instead of large sharp angles, reducing the chance of injury. It is best used for applications where the fire will not be near the glass, as constant temperatures of 500 degrees or more will cause it to weaken and shatter.

what is the speed of sound in temperature of 56 degrees C?

**Answer:**

**Answer:**

316 meters/second

Which scenario does not describe an example of acceleration?

A car increases its speed while turning to the left.

A car decreases its speed while driving straight ahead.

A car maintains a constant speed while turning to the right.

A car maintains a constant speed while driving straight ahead.

**Answer:**

B is the right answer

**Explanation:**

It is decreasing.

A car maintains a **constant speed** while driving straight ahead.

The **acceleration **of an object is the rate of change of velocity with time. It is measured in meter per second square.

The car undergoes velocity when there is change in direction of the speed.

Thus, the only option that does not describe **acceleration **is a car maintains a **constant speed** while driving straight ahead.

Learn more about **acceleration **here: https://brainly.com/question/14344386

A 1500 kg car traveling at 15m/s to the south collides with a 4500 kg truck that is initially at rest at a stoplight. the car and truck stick together and move together after the collision, what is the final velocity of the two vehicles

**Answer: 3.75 m/s**

**Explanation:**

Here's what you know: The car has mass 1500 kg, and initial velocity 15.0 m/s. The truck has mass 4500 kg and initial velocity 0 m/s. The final mass is 6000 kg (4500 kg plus 1500 kg, because they stick together) and we are looking for the final velocity. Using the formula p = mv, and the concept that p before equals p after, the p of the car plus p of the truck equals the p of them together. So, 1500 x 15 + 4500 x 0 = 6000 x v final. 22500 = 6000 v, and v = 3.75 m/s. The velocity is positive, and the initial velocity of the car was positive, so the two vehicles together are traveling to the south just like the car was initially.

Which is a physical property of matter that is always the same regardless of size or amount

**Answer:**

ntensive properties: A physical property that will be the same regardless of the amount of matter.

**Explanation:**

why can't you run from momentum ?

Two kids walk through the woods discussing momentum. I mean, who wouldn’t?

Okay, fine. It’s a basic introduction to the concept of momentum.

Okay, fine. It’s a basic introduction to the concept of momentum.

is isopropyl alcohol a element compound or mixture

**Answer:**

Isopropyl is an element compound.

**Explanation:**

An apple is dropped from a 260m high building. How long will it take to hit the ground in

seconds)?

**Answer:**

7.28 s

**Explanation:**

s=-260

u=0

assume a=-9.81

t=?

s=1/2at^2 + ut

-260=1/2 (-9.81) t^2 +0t

t=7.28 s

The** time taken** for the apple to **hit the ground** from the high building is **7.28s.**

Given the data in the question;

Before the apple was dropped, it was initially at rest, so

Initial velocity; [tex]u = 0 m/s[/tex]Distance or height from which it was dropped from; [tex]s = 260m[/tex]

To find the time it will take for the apple to hit the ground

We use the **Second Equation of Motion:**

[tex]s = u^2 + \frac{1}{2}at^2[/tex]

Where **s **is the **distance **or **height **from which it was dropped, **u **is its **initial velocity**, **t **is **time **and **a **is the **acceleration due **to **gravity.**

We know that earth's gravitational field or acceleration due to gravity; [tex]g = 9.8m/s^2[/tex]

Since the apple is falling, it under gravity; [tex]a = g = 9.8m/s^2[/tex]

We substitute our values into the equation and find** t**

[tex]260m = (0m/s)^2 + (\frac{1}{2} \ *\ 9.8m/s^2\ *\ t^2 )\\\\260m = 4.9m/s^2 \ * \ t^2\\\\t^2 = \frac{260m}{4.9m/s^2}\\\\t^2 = 53.06^2\\\\t = \sqrt{53.06s^2} \\\\t = 7.28s[/tex]

Therefore, the** time taken** for the apple to** hit the ground** from the high building is **7.28s**

Learn more; https://brainly.com/question/20534444

whats the order of solid liquid and gas from least particle motion to the most?

**Answer:**

Solid < Liquid < Gas

what is the least efficient way to roast a marshmallow using heat transfer conduction, convection, or radiation?

**Answer:**

convection

**Explanation:**

The only way convection can only take place in liquids and gas.Since the marshmello is neither,convection is the least effective way

what is one second time ?

**Answer:**

one second is defined au1/86400th the part of a solar day

The sum of potential energy and kinetic energy is

**Answer:**

The total mechanical energy

**Explanation:**

M = Mass

V = Velocity

G = Gravity

H = Height

KE = 1/2mv²

PE = mgh

ME = KE + PE

ME = 1/2 mv² + mgh

Problem #2: An apple is thrown upward with an initial velocity of +24.0 m/s. a. Sketch the apple's trip and label what you know. b. How high will the apple go? (Ans: +29.4 m) c. What is the total time needed for the apple to return to its original position? (Ans: 4.90 s)

**Answer:**

The answer is below

**Explanation:**

a) The initial velocity (u) = 24 m/s

We can solve this problem using the formula:

v² = u² - 2gh

where v = final velocity, g= acceleration due to gravity = 9.8 m/s², h = height.

At maximum height, the final velocity = 0 m/s

v² = u² - 2gh

0² = 24² - 2(9.8)h

2(9.8)h = 24²

2(9.8)h = 576

19.6h = 576

h = 29.4 m

b) The time taken to reach the maximum height is given as:

v = u - gt

0 = 24 - 9.8t

9.8t = 24

t = 2.45 s

The total time needed for the apple to return to its original position = 2t = 2 * 2.45 = 4.9 s

A 15-N force and a 45-N force act on an object in opposite directions

What is the net force on the object? *

**Answer:**

30-N

**Explanation:**

Because they are both acting on an object going opposite directions, then you simply subtract the 15 from 45 as 45N of force is stronger than 15N of force.

The net **force **on the **object **is 30 Newton due to these two **opposite **forces.

The definition of **force **in physics is: The push or pull on a massed object changes its velocity. An external **force **is an agent that has the power to alter the resting or moving condition of a body. It has a **direction **and a magnitude.

A spring balance can be used to calculate the **Force**. The Newton is the SI unit of **force**.

Here, a 15-N **force **and a 45-N **force **act on an object in opposite directions.

The **net force **on the object due to these two opposite forces is = 45 N - 15 N

= 30 N.

Learn more about **force **here:

https://brainly.com/question/13191643

#SPJ6

Look at pic.... 2 examples of radiation and how they are radiation

**Answer:21**

**Explanation:**

5. Michael wanted to see what kitchen cleaner worked best for cleaning her counters. He used Lysol, Clorox, Pine-sol, and just water. For each cleaner, he put 5 milliliters of grape juice on the counter, sprayed the cleaner, and wiped it with one paper towel.

Answer:

Michael wanted to see what kitchen cleaner worked best for cleaning his counters. He used Lysol, Clorox, Pine-Sol, and water. For each cleaner, he used 5 milliliters of grape juice on the counter, sprayed the cleaner, and wiped it with one paper towel. Which of the following would be a constant?

answer choices:

-Lysol

-Cleaning products

-5 milliliters of grape juice

-Cleanest countertop recorded

5 milliliters of grape juice will be constant.

Explanation:

The different cleaning agents have different cleaning capabilities and some will require more of its quantity than others to clean the counter.

Secondly, only the grape juice has a measured amount of 5 milliliters

The slope of a distance vs. time graph is a measurement called

A. displacement

B. speed

C. correlation

D. velocity

**Answer:**

B. speed

**Explanation:**

im not sure hahahaha

What are some common measurements that are given as a rate?

**Answer:**

taco bell

**Explanation:**

velocity is derived physical quantity why

**Answer:**

Velocity is “how much distance you cover in a particular time.” Space and time are fundamental quantities, and meters and seconds are their base units. Velocity is a combination of a space and a time, and therefore its units — “m/s” – are “derived” from the units for space and time

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