4
2 points
Which of the following is a vector quantity?
O Velocity
O
Time
Speed
оо
Distance

Answer:

if a force does a negative amount of work on an object ,so the speed of the object got  decrease  ,because the acceleration  becomes negative  so if the acceleration becomes negative so the speed is decreased.

Explanation:

Answer:

A: Opposite

Explanation:

From Newton's third law of motion, to every action there is an equal an opposite reaction. Thus, when the wave hits a fixed boundary, it is returned as a reflected wave to the starting point albeit on the other side.

Answer:

Combined momentum = 12,000 Kgm/s

Explanation: 4000 kg m/s south

hope that helps :)

Answer:

well for me it's

Explanation:

L2-L1/L1(O2-O1)

O is the change in temperature

Answer:

When light gets in contact with water, it emerges into the air, and then it speeds up, which makes it look shallower than it actually is.

Explanation:

Answer:

Refraction

Explanation:

Light rays reflected from the fish are refracted at the surface of the water, but the eyes and brain trace the light rays back into the water as thought they had not refracted, but traveled away from the fish in a straight line. This effect creates a "virtual" image of the fish that appears at a shallower depth.

Answer:

400cos(60) = 200m/s

100(v) = 0.035(200)

v= 0.07m/s

Answer: a) 2,508

Explanation:

Answer:

A)0.1m

B)vf= 35cm/s

Explanation:

Answer:

Intercellular communication refers to the communication between cells. Membrane vesicle trafficking has an important role in intercellular communications in humans and animals, e.g., in synaptic transmission, hormone secretion via vesicular exocytosis.

Answer:

1. far

2. a couple of seconds

3.  a mile or so

Explanation:

Answer:

The pumpkin's vertical displacement  is H=27.76m

The pumpkin's vertical velocity when it hits the ground is v=23.32m/s

Explanation:

x=v*t

9.5=4*t

t=2.38s

H=vi(t)+1/2at^2

H=1/2at^2

H=1/2(9.8)(2.38)^2=27.76

vf=vi+at

vf=2.38(9.8)

vf=23.32m/s

Answer:

none it's Hydroelectric energy

Answer:

✨ love ✨

words words words words words words words words words words words

Answer:

butter

Explanation:

Answer:

Explanation:

The potential energy of a body can be found by using the formula

PE = mgh

where

m is the mass

h is the height

g is the acceleration due to gravity which is 10 m/s²

From the question we have

PE = 60 × 10 × 4

We have the final answer as

Hope this helps you

Answer:

a = v²/r

Explanation:

The acceleration of a body moving in a circular path is known as the centripetal acceleration. This is the acceleration of a body that keeps the body within the circular path. It is written in terms of the linear velocity v and the radius of the circle of rotation as shown;

a = v²/r where

v is the linear velocity

r is the radius

a is the centripetal acceleration

Answer:

a) The position vector of P is [tex]\vec P =(0, 2,4)[/tex].

b) The distance vector from P to Q is [tex]\overrightarrow{PQ} = (-3,-1,1)[/tex].

c) The distance between P and Q is [tex]\|\overrightarrow{PQ}\|=\sqrt{11}[/tex].

d) A vector parallel to PQ with magnitude of 10 is [tex]\vec v = \left(-\frac{30\sqrt{11}}{11},-\frac{10\sqrt{11}}{11}, \frac{10\sqrt{11}}{11} \right)[/tex].

Explanation:

a) The position vector of a point is the vector displacement from the origin to the location of the point. That is:

[tex]\vec P = (0,2,4)-(0,0,0)[/tex]

[tex]\vec P = (0-0, 2-0, 4-0)[/tex]

[tex]\vec P =(0, 2,4)[/tex]

The position vector of P is [tex]\vec P =(0, 2,4)[/tex].

b) First, we calculate the position vector of point Q:

[tex]\vec Q = (-3,1,5)-(0,0,0)[/tex]

[tex]\vec Q = (-3-0,1-0,5-0)[/tex]

[tex]\vec Q =(-3,1,5)[/tex]

The distance vector from P to Q is define by the following vectorial expression:

[tex]\overrightarrow{PQ} = \vec Q - \vec P[/tex] (1)

[tex]\overrightarrow{PQ} = (-3,1,5)-(0,2,4)[/tex]

[tex]\overrightarrow{PQ} =(-3-0,1-2,5-4)[/tex]

[tex]\overrightarrow{PQ} = (-3,-1,1)[/tex]

The distance vector from P to Q is [tex]\overrightarrow{PQ} = (-3,-1,1)[/tex].

c) There are two approaches to calculate the distance between P and Q:

First Method - Pythagorean Theorem:

[tex]\|\overrightarrow{PQ}\| = \sqrt{(-3)^{2}+(-1)^{2}+1^{2}}[/tex]

[tex]\|\overrightarrow{PQ}\|=\sqrt{11}[/tex]

Second Method - Dot Product:

[tex]\|\overrightarrow{PQ}\| = \sqrt{\overrightarrow{PQ}\,\bullet\,\overrightarrow{PQ}}[/tex] (2)

[tex]\|\overrightarrow{PQ}\| = \sqrt{(-3,-1,1)\,\bullet (-3,-1,1)}[/tex]

[tex]\|\overrightarrow{PQ}\|=\sqrt{11}[/tex]

The distance between P and Q is [tex]\|\overrightarrow{PQ}\|=\sqrt{11}[/tex].

d) To determine a vector parallel to PQ with a given magnitude is determined by the following expression:

[tex]\vec v = \frac{k}{\|\overrightarrow{PQ}\|} \cdot \overrightarrow{PQ}[/tex] (3)

Where [tex]k[/tex] is the scale factor.

If we know that [tex]\overrightarrow{PQ} = (-3,-1,1)[/tex], [tex]\|\overrightarrow{PQ}\|=\sqrt{11}[/tex] and [tex]k = 10[/tex], then the vector is:

[tex]\vec v = \frac{10}{\sqrt{11}}\cdot (-3,-1,1)[/tex]

[tex]\vec v = \left(-\frac{30}{\sqrt{11}},-\frac{10}{\sqrt{11}},\frac{10}{\sqrt{11}}\right)[/tex]

[tex]\vec v = \left(-\frac{30\sqrt{11}}{11},-\frac{10\sqrt{11}}{11}, \frac{10\sqrt{11}}{11} \right)[/tex]

A vector parallel to PQ with magnitude of 10 is [tex]\vec v = \left(-\frac{30\sqrt{11}}{11},-\frac{10\sqrt{11}}{11}, \frac{10\sqrt{11}}{11} \right)[/tex].

Answer:

h' = 603.08 m

Explanation:

First, we will calculate the initial velocity of the pellet on the surface of Earth by using third equation of motion:

2gh = Vf² - Vi²

where,

g = acceleration due to gravity on the surface of earth = - 9.8 m/s² (negative sign due to upward motion)

h = height of pellet = 100 m

Vf = final velocity of pellet = 0 m/s (since, pellet will momentarily stop at highest point)

Vi = Initial Velocity of Pellet = ?

Therefore,

(2)(-9.8 m/s²)(100 m) = (0 m/s)² - Vi²

Vi = √(1960 m²/s²)

Vi = 44.27 m/s

Now, we use this equation at the surface of moon with same initial velocity:

2g'h' = Vf² - Vi²

where,

g' = acceleration due to gravity on the surface of moon = 1.625 m/s²

h' = maximum height gained by pellet on moon = ?

Therefore,

2(1.625 m/s²)h' = (44.27 m/s)² - (0 m/s)²

h' = (1960 m²/s²)/(3.25 m/s²)

h' = 603.08 m

Answer:

As the Speed increases , the potential energy decreases

Answer:

Since the object only has so much total internal energy, and the faster an object moves the larger the kinetic energy is, hence the potential energy will decrease as a result of speed increasing.

Explanation:

Hope this helped!

Answer:

D: It shows that Frida Kahlo used art to cope with her pain.

Explanation:

Within the text given it shows her emotions being lonely, immobile and in pain. But it all shows her asking her father for art which states that art is her sort of relief and happy place.

Answer:

It shows that Frida Kahlo used art to cope with her pain.

Explanation:

Answer:

See list below

Explanation:

5. positively charged particles : D

6. dense center of the atom: C

7. negatively charged particles: A

8. articles with NO charge: B

Answer:

true

Explanation:

Answer:

27km/h that's the answer

Answer:

The efficiency of the heat engine is 33.33%.

Explanation:

Given;

input energy of the heat engine, = 6000 J

energy lost by the heat engine, = 4000 J

output energy of the heat engine = 6000 J - 4000 J = 2000 J

The efficiency of the heat engine is given as;

Efficiency = output energy / input energy

Efficiency = 2000 / 6000

Efficiency = 0.3333

Efficiency (%) = 33.33%

Therefore, the efficiency of the heat engine is 33.33%.

Answer:

the kinetic energy of A will be twice that of B

Explanation:

The formula for calculating kinetic energy is expressed using the formula

KE = 1/2mv²

m is the mass of the object

v is the velocity

For object A:

KEA = 1/2mAvA²

For object B:

KEB = 1/2mBvB² ... 1

If object A is twice the mass of object B, then mA = 2mB

From 1:

KEA = 1/2mAvA²

Substitute mA = 2mB

KEA = 1/2(2mB)vA² .... 2

Divide 1 by 2

KEB/KEA = 1/2mBvB²/mBvA²

KEB/KEA = 1/2vB²/vA²

Assuming they have the same velocities then vA ,= VB

The equation becomes:

KEB/KEA = 1/2vB²/vA²

KEB/KEA = 1/2vB²/vB²

KEB/KEA = 1/2

KEA = 2EB

Hence the kinetic energy of A will be twice that of B

Answer:

Inelastic collision.

Explanation:

Because both the momentum of the man and that of the car, is conserved because they are both moving with the same velocity.

Also kinetic energy is not conserved because the car moved with different kinetic energy, as well as the man.

When they came into contact, the final kinetic energy is different from the initial kinetic energy.

Answer:

perfectly inelastic

Explanation:

Answer: See explanation

Explanation:

Simple machine is a machine that has few moving parts or may also have no moving parts and they are usually used to make ones work easier. Examples include wheel and axle, wedge, pulley, lever, screw or an inclined plane.

Their advantages include:

• Less energy is required to perform a particular work.

• It makes work easier.

• It makes work faster.

• Simple machine enable one to do things that might have been difficult to achieve or do.

Answer:

Opposite

Explanation:

Waves that hit a fixed boundary return to the starting point on the opposite side that it began.

After striking, the wave gets reflected and it moves in the direction opposite to the initial direction.

Hence, it would mean that waves that hit a fixed boundary return to the starting point on the opposite direction.

Elements of art are stylistic features that are included within an art piece to help the artist communicate. The seven most common elements include line, shape, texture, form, space, colour and value, with the additions of mark making, and materiality.

You would create a darker value if you shaded it, shading it makes it darker.