Answer:
Speed is a scalar quantity it is the rate of change in the distance travelled by an object, while velocity is a vector quantity it is the speed of an object in a particular direction.
If an object weighs 20 N and is sitting on the floor without moving, what must be the normal force of the floor acting on the box?
20 N up
20 N down
10 N up
10 N down
Answer:
20 N up
Explanation:
Since the object on the floor is sitting still. Based on Newton's law of force. Objects must have equal reaction and force against each other for still objects. So the answer is 20 N up. Since the force are equal on both sides making the object not moving.
An arrow is shot at 27.0° above the horizontal. Its velocity is 54 m/s, and it hits the target.
Explanation:
(a) What is the maximum height the arrow will attain?
Given:
v₀ᵧ = 54 sin 27.0° m/s = 24.5 m/s
vᵧ = 0 m/s
aᵧ = -9.8 m/s²
Find: Δy
vᵧ² = v₀ᵧ² + 2aᵧΔy
(0 m/s)² = (24.5 m/s)² + 2 (-9.8 m/s²) Δy
Δy = 30.7 m
(b) The target is at the height from which the arrow was shot. How far away is it?
Given:
Δy = 0 m
v₀ᵧ = 54 sin 27.0° m/s = 24.5 m/s
aᵧ = -9.8 m/s²
Find: t
Δy = v₀ᵧ t + ½ aᵧt²
0 m = (24.5 m/s) t + ½ (-9.8 m/s²) t²
t = 5.00 s
Given:
v₀ₓ = 54 cos 27.0° m/s = 48.1 m/s
aₓ = 0 m/s²
t = 5.00 s
Find: Δx
Δx = v₀ₓ t + ½ aₓt²
Δx = (48.1 m/s) (5.00 s) + ½ (0 m/s²) (5.00 s)²
Δx = 241 m
you walk at a speed of 1.5 m/s and it takes you 1800 seconds to get to your friends house. if you follow the same route, how fast would you need to travel to get there un 600 seconds
Answer:
4 miles per hour
Explanation:
Your welcome
Todd and Angela set up a ramp and released several cars from the top. If Todd and Angela want to determine the average speed of their cars down the ramp, what information do they need? Group of answer choices
Answer:
The ramps length, height, degree, and the weight of the car.
Explanation:
Answer:
I think they need the slope of the ram(degree) .
& current gravitational acceleration
& the length of the ram and also l don't think mass of the cars are not needed becoz the acceleration of the cars are given by its,
Gravitational acceleration * sin( slope).
So then use that in v^2=u^2+2as equation.
s for length
a for acceleration
v for end velocity
u for start velocity
what is modulus of elasticity for shearing stress and strain called?
23 14
2. Calculate: You can use trigonometry to find the initial horizontal and vertical components of the ball's
velocity. Take out your calculator now. Click Reset, and turn off Show velocity vector and Show velocity
components. Set Vinitial to 50.0 m/s and 8 to 60.0 degrees.
A.
To calculate vy, multiply Vinitial by the cosine of the angle: V = Viral · cos(O):
B. To calculate vy, multiply Vmisial by the sine of the angle: v, = Vinitial sin(C):
C. Turn on Show velocity components. Were you correct?
Answer:
(A). The horizontal initial velocity is 25 m/s.
(B). The vertical initial velocity is 43.3 m/s.
(C). The velocity component is
[tex]u_{x}=u\cos\theta[/tex]
[tex]u_{y}=u\sin\theta[/tex]
Explanation:
Given that,
Initial velocity = 50.0 m/s
Angle = 60°
We need to calculate the component of velocity
Using formula of component
(A). Horizontal initial velocity
[tex]\cos\theta=\dfrac{u_{x}}{u}[/tex]
Put the value in to the formula
[tex]\cos60=\dfrac{u_{x}}{50}[/tex]
[tex]u_{x}=50\times\cos60[/tex]
[tex]u_{x}=25\ m/s[/tex]
(B). Vertical initial velocity
[tex]\sin\theta=\dfrac{u_{y}}{u}[/tex]
Put the value in to the formula
[tex]\sin60=\dfrac{u_{y}}{50}[/tex]
[tex]u_{y}=50\times\sin60[/tex]
[tex]u_{y}=43.3\ m/s[/tex]
The velocity component is
[tex]u_{x}=u\cos\theta[/tex]
[tex]u_{y}=u\sin\theta[/tex]
Hence, (A). The horizontal initial velocity is 25 m/s.
(B). The vertical initial velocity is 43.3 m/s.
(C). The velocity component is
[tex]u_{x}=u\cos\theta[/tex]
[tex]u_{y}=u\sin\theta[/tex]
A boat moving at a constant speed travels 15 meters in 8 seconds. How far does it travel
in 40 seconds?
O 75 meters
53 meters
335 meters
480 meters
If your awesome, click here and be the first, to be the brainest
Answer:
im awesomeee
Explanation:
.
Answer:
Doubt I'll be first but imma try
Explanation:
A 6.46 kg object moving with a velocity of 5.23 m/s is struck from behind by a moving 11.77 kg object. They stick together, moving off with a mutual velocity of 17.93 m/s. What was the original velocity of the 11.77 kg object before the collision?
Answer:
its z trust me
Explanation:
trust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetrust meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Which of the following is a vector quantity?
A. 30 miles
B. 30 mph northwest
C. 55 m/s
D. 20 mph
Answer:
B) 30 mph northwest
Explanation: Vector quantities have both direction and magnitude. In this case the direction is northwest, and magnitude is 30 mph.
The following is a vector quantity, 30 mph northwest. Option B is correct.
What is a vector quantity?A vector quantity is a physical quantity that has both magnitude and direction. Examples of vector quantities include displacement, velocity, acceleration, force, and momentum.
In contrast, a scalar quantity is a physical quantity that has only magnitude and no direction associated with it. Examples of scalar quantities include speed, distance, mass, temperature, and time.
Here,
A vector quantity is a physical quantity that has both magnitude and direction. In this case, the magnitude is 30 mph and the direction is northwest, which makes it a vector quantity.
Option A is a scalar quantity because it only has a magnitude, but no direction associated with it. Option C is also a vector quantity because it has both magnitude and direction, but it is not given a direction in the question. Option D is a scalar quantity because it only has a magnitude.
Thus, the following is a vector quantity, 30 mph northwest. Option B is correct.
Learn more about vector quantity here:
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How long does it take sound to travel 3525 meters (speed of sound is 330 m/s)?
If nitrogen, which has an electronegativity of 2.0, bonda with hydrogen, which has an electronegativity of 2.1, the bond between the two atoms will be classified as a(n) _________ covalent bond.
Answer: it’s Nonpolar
Explanation:
Atoms with small differences in their electronegativities are said to form nonpolar covalent bonds.
Answer:
caden
Explanation:
PLEASE HELP!!!
What is the sum of all forces that act upon an object called?
a
Net force
b
Balanced force
c
Unbalanced force
d
Gravitational force
Answer:
net force
Explanation:
The net force is the vector sum of all the forces that act upon an object. That is to say, the net force is the sum of all the forces, taking into account the fact that a force is a vector and two forces of equal magnitude and opposite direction will cancel each other out.
Answer:
a
Explanation:
In an aqueous solution where the H+ concentration is 1 x 10-6 M, the OH concentration must be:
A. 14 x 10-6 M
B. 1 x 10-6 M
C. 1 x 10-7 M
D. 1x 10-8 M
E. 14 x 10-8 M
Answer:
D. 1×10⁻⁸ M
Explanation:
[H⁺] [OH⁻] = 10⁻¹⁴
(1×10⁻⁶) [OH⁻] = 10⁻¹⁴
[OH⁻] = 1×10⁻⁸
The concentration of hydroxyl ion will be [tex]10^{-8}[/tex]M.
What is concentration?The amount of a chemical substance in a mixture is expressed by the substance's concentration.
Calculation of concentration.
Given data:
Concentration of H+ = 1 x [tex]10^{-6}[/tex] M.
It is known that,
[[tex]H^{+}[/tex]][[tex]OH^{-}[/tex]] = [tex]10^{-14}[/tex]M
Now, put the value of concentration of [[tex]H^{+}[/tex]] in above equation.
[1× [tex]10^{-6}[/tex]][[tex]OH^{-}[/tex]] = [tex]10^{-14}[/tex]M
[[tex]OH^{-}[/tex]] = [tex]10^{-14}[/tex] / [1× [tex]10^{-6}[/tex]]M
[[tex]OH^{-}[/tex]] = [tex]10^{-8}[/tex]M
Therefore, the concentration of hydroxyl ion will be [tex]10^{-8}[/tex]M.
Hence, the correct answer will be an option (D).
To know more about concentration
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1 hr 16 minutes equal how many minutes ?
Answer:
76 minutes.
Explanation:
There are 60 minutes in an hour + 16 minutes= 76 minutes.
Which of the following describes the rate at which work is done?
Force
Energy
Power
Impulse
Answer:
power
Explanation:
Please help it’s physics and I suck at this subject :(
if a big stone and a small stone is dropped simultaneously from the certain height. they fall together why??
Because it takes more force to accelerate a mass, and gravity exerts more force on a greater mass. So every object winds up with the same acceleration.
And THAT, of course, says that all objects in the same gravity will pick up the same speed in the same time, and fall the same distance in the same time.
The geometry of a hydrogen-bromide molecule is ____.
Answer:
polar-molecule
Explanation:
hELP URGENT PLEASEE!!!
Answer:
1. Solid, liquid, gas, plasma
3. latent heat of vaporization
4. melting
6. heat
7. amount of heat transferred when 1g of a substance melts or freezes
Answer:
1. Solid, liquid, gas, plasma
2. In a solid and liquid, the particles are close together. In a solid, the particles are packed close together and are held in a fixed position. ... In liquids, particles are usually almost as close to each other as in solids.
3. latent heat of vaporization
4. melting
5. As the temperature falls, the particles slow down. If a liquid is cooled sufficiently, it forms a solid.
6. heat
7. amount of heat transferred when 1g of a substance melts or freezes
Explanation:
Textbook online
The properties of a rectangular prism are listed below:
Density = 120 g/cm with an exponent of 3
Length = 4 cm
Width = 2 cm
Height = 1 cm
What is the mass of the rectangular prism?
a
15 g
b
45 g
c
960 g
d
980 g
WILL GIVE BRAINLIEST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!TO THE FIRST PERSON WHO ANSWERS!!!!!!!!!!!!!!!!!!!!!
Answer:
B. 45 g because it is the given answer of the division that is given to the equation
a cheerleader throws herself into the air with a velocity of 12 m/s at an angle of 75 degrees above the horizontal. what are the x- and y components of her velocity (show work)
Answer:
Vx = 3.10 [m/s]
Vy = 11.59 [m/s]
Explanation:
To solve this problem we must decompose the velocity vector by means of the angle on the horizontal.
v = 12 [m/s]
Vx = 12*cos (75) = 3.10 [m/s]
Vy = 12*sin (75) = 11.59 [m/s]
A goose is flying due south at 20 km/hr, the goose is flying into a 15 km/hr due north wind. What is the gooses resultant velocity?
Answer:
5 km/hr due south
Explanation:
We need to subtract the two velocities due to the fact that they are in opposite directions (one due south and the other one due north). Then, for an observer located on earth, the goose will be flying at :
20 km/hr - 15 km/hr = 5 km/hr
Use the drop-down menus to complete the statements.
A vertical column of elements in the periodic table is called a .
A horizontal row of elements in the periodic table is called a .
Atoms of elements in the same group have the same .
As you move from left to right on the periodic table, the atomic number .
Explanation:
A vertical column of elements in the periodic table is called a group
A horizontal row of elements in the periodic table is called a period
Atoms of elements in the same group have the same number of valence electrons
As you move from left to right on the periodic table, the atomic number increases
Answer: the first one is group
2. Period
3. Number of valence elections
4. increases
A frog falls from its rainforest tree. If we ignore wind resistance, (a) how much time does it take the frog to fall a distance of 12.0 m? (b) how fast is the frog falling at this point?
Answer:
Explanation:
a) Using the equation of motion
S = ut + 1/2gt²
S is the distance of fall
g is the acceleration due to gravity
t is the time taken
Given S = 12.0m, g = 9.81m/s^2, un= 0m/s
12 = 0+1/2(9.81)t²
12 = 4.905t²²²
t² = 12/4.905
t² = 2.446
t = √2.446
t = 1.56secs
b) To determine how fast is the frog falling at this point, we need to calculate the speed of the frog. Using the equaton v = u+gt
v = 0+9.81(1.56)
v = 15.34m/s
Hence the frog is falling at the rate of 15.34m/s
What phase of the moon would this be?
1st quarter, waxing half moon
3rd quarter, waning half moon
waxing gibbous
waning gibbous
Answer:
First Quarter
Explanation:
what we call the state in a human body if cerebrum is not functioning well
HELP!!!! WILL MARK BRAINLIEST!!
Fill in the names of the neuron parts and their functions. After you've filled in all the answers, click on
the puzzle pieces next to the answer spaces to check your success
Answer:
A) Dendrite
Receives information from other neutrons and transmits information into the soma/cell body.B) Soma
Contains the nucleus of the neutral cell and maintains chemicals that keep the neutron functioning properly, also provides energy for the cell.C) Axon
Transmits signals away from the soma to other neutrons, muscles, or glands.D) Myelin Sheath
Insulated fatty material that surrounds an axon and speeds up signal transmission.E) Synapse
The junction where neutrons connect to transmit electrical or chemical information.Explanation:
EDG 100%
What is the height where a 110.8 kg woman would have a gravitational potential energy of 8741 J?
Answer:
8.042m
Explanation:
Ep = mgh
given that ,
m = 110.8kg
h =?
g = 9.81 m/s^2
Ep= 8741J
8741= 110.8 × 9.81 × h
h= 8741 ÷ ( 110.8 × 9.81 )
h = 8.042m
Mountains can ONLY be formed by continental crust colliding?
True
False
Answer
:Fold mountains are often associated with continental crust. They are created at convergent plate boundaries, sometimes called continental collision zones or compression zones. Convergent plate boundaries are sites of collisions, where tectonic plates crash into each other.
