Answer:
Alkaline earth metals.
Explanation:
For e.g The metals of group ll are: Be, Mg, Ca, etc
If Thor throws his axe horizontally at a velocity of 50 m/s at and a height of 20 m, how long does it take before it hits the ground? (gravity is 9.8 m/s^2)
Answer:
The time taken before the axe hits the ground is 0.385 s.
Explanation:
Given;
initial velocity, u = 50 m/s
height above ground, h = 20 m
To determine the time taken before the axe hits the ground, apply the following kinematic equation;
h = ut + ¹/₂gt²
20 = 50t + ¹/₂(9.8)t²
20 = 50t + 4.9t²
4.9t² + 50t - 20 = 0
Solve this quadratic equation;
a = 4.9, b = 50, c = -20
t = 0.385 s
Therefore, the time taken before the axe hits the ground is 0.385 s.
If a football player has a weight of 600 N on earth, what would his weight be on the moon?
Answer:
99n
Explanation:
Which of the following information about motion can be determined by looking at a position vs. time graph that is a straight line?
a.frame of reference
b.average acceleration
c.velocity
d.direction of force applied
Answer:
Velocity
Explanation:
If the position-time graph of the motion of an object is a straight line, it would mean that the object is moving uniformly. The velocity or the slope of the object is constant in such case. If the slope is curved line, it means that the velocity is not constant.
Hence, the correct option is (c).
HELP what is the answer to this question?
Answer:
b
Explanation:
A 3,000kg car rests on rough horizontal ground. A rope is
attached to the car and is pulled with a force of 11,000N to the
left. As a result, the car accelerates at 3 m/s2. The coefficient of
sliding friction (1) between the car and the ground is?
Answer:
0.07
Explanation:
Huge Brain
Coefficient of friction between the car and the ground will be 0.07.
Given in the question,
Mass of the car 'm' = 3000 kgForce 'F' by which the car is pulled = 11000 NAcceleration 'a' by which the car gets accelerated = 3 meters per second²Force applied on the car by which the car is accelerated,
F = ma
= 3000 × 3
= 9000 N
Force [tex]F_k[/tex] to overcome the friction = 11000 - 9000
= 2000 N
Gravitational force F' on the car = mg
= 3000(9.8)
= 29400 N
Since, [tex]\mu_k=\frac{F_k}{F'}[/tex]
[tex]=\frac{2000}{29400}[/tex]
[tex]=0.068[/tex]
≈ 0.07
Therefore, coefficient of friction between the car and the ground will be 0.07.
Learn more,
https://brainly.com/question/17412150
A boat moving at a constant speed travels 15 meters in 8 seconds. How far does it travel
in 40 seconds?
0 75 meters
53 meters
335 meters
0 480 meters
Answer:
75m
Explanation:
Given parameters:
Distance covered by the boat = 15m
Time taken = 8s
Unknown:
Distance covered by the boat in 40s = ?
Solution:
To solve this problem, we need to find the speed of the boat first;
Speed = [tex]\frac{distance}{time}[/tex]
Insert the parameters and solve;
Speed =[tex]\frac{15}{8}[/tex] m/s
Now;
The boat will travel;
Distance = speed x time
Distance = [tex]\frac{15}{8}[/tex] x 40 = 75m
When the light turns green, Mark accelerates straight down the road at 1.8 m/s2 for 8 seconds. What is his final velocity at the end of those 8 seconds?
Answer:
14.4m/s
Explanation:
To calculate the final velocity (V), we use the formula:
v = u + at
Where; v = final velocity (m/s)
u = initial velocity (m/s)
a = acceleration (m/s²)
t = time (s)
According to the provided information in this question, v = ?, u = 0m/s, a = 1.8m/s², t = 8s
Hence, v = u + at
v = 0 + (1.8 × 8)
v = 0 + 14.4
v = 14.4m/s
Therefore, his final velocity at the end of those 8 seconds is 14.4m/s.
Earth’s gravitational force
(1 Point)
Is the same strength, no matter where you are on Earth.
Does not affect objects orbiting the Earth.
Fluctuates or changes depending on your location on Earth.
Changes the mass of an object.
kenneth warmed up a 100- ml sample of air in and expandable container. he displayed the resluts in the following graph. the resluts formed a straight line, so he extended the line the full length of the graph
Answer:
300,000
Explanation:
in an observational study researchers try not too ?
They try not to influence the subjects
Explanation:
PLEASE HELP ASAP
A physics student is adjusting the settings of their projectile launcher. If the VX =28 m/s and the Vy = 15 m/s, what is the magnitude of its velocity?32 m/s
13 m/s
43 m/s
1009 m/s
Answer:
The first choice (32m/s) is the closest to the answer
Explanation:
The magnitude of a vector is the distance between the initial and the end point of the vector.
Being Vx and Vy the horizontal and vertical components of the vector V respectively, the magnitude of V is calculated as:
[tex]\mid \vec{V} \mid =\sqrt{V_x^2+V_y^2}[/tex]
The components of the velocity of the physics student's projectile launcher are Vx=28 m/s and Vy=15 m/s.
Calculate the magnitude of the velocity:
[tex]\mid \vec{V} \mid =\sqrt{28^2+15^2}[/tex]
[tex]\mid \vec{V} \mid =\sqrt{784+225}[/tex]
[tex]\mid \vec{V} \mid =\sqrt{1009}[/tex]
[tex]\mid \vec{V} \mid =31.8 \ m/s[/tex]
The first choice (32m/s) is the closest to the answer
Choose a sport you like, such as football or gymnastics. Describe how a high level of flexibility would affect your performance in that sport. Consider the benefits in many aspects of the sport.
The level of flexibility will affect my performances in football. Football
requires some level of flexibility to do certain things.
Flexibility will enable me change speed and direction easily when there is a
counter attack by the opponents. It will also assist in using some techniques
such as adding more curve on the football with the feet in order to score
goals.
Flexibility will also ensure that there will be lesser injury concerns because there will be less sprains or other muscle related injuries.
Read more on https://brainly.com/question/18472626
5 points Place the descriptions of the atomic models in order from oldest to most-recent. Oldest Atomic Model 1 Solid ball, no subatomic particles. 2 A dense nucleus with protons and neutrons is in the center of the atom. The electrons travel around the nucleus in distinct energy levels. 3 # The atom is mostly empty space. A dense nucleus with protons and neutrons is in the center and electrons travel around it randomly. 4 Solid ball of positive materials with electrons scattered throughout. (Plum Pudding Model) Сл A dense nucleus with protons and neutrons in the center of the atom. The electrons are found in "electron clouds" which surround the nucleus. Electron cloud show where electrons are likely to be, but not exactly where they are. Most-recent atomic model. How would I put them in order?
Answer:
1 Solid ball, no subatomic particles.
4 Solid ball of positive materials with electrons scattered throughout. (Plum Pudding Model)
3 # The atom is mostly empty space. A dense nucleus with protons and neutrons is in the center and electrons travel around it randomly.
2 A dense nucleus with protons and neutrons is in the center of the atom. The electrons travel around the nucleus in distinct energy levels.
Сл A dense nucleus with protons and neutrons in the center of the atom. The electrons are found in "electron clouds" which surround the nucleus. Electron cloud show where electrons are likely to be, but not exactly where they are.
Explanation:
1 Solid ball, no subatomic particles. This model was proposed by some Greek Philosophers and John Dalton in 1803. That matter was made up of small indivisible substances called atoms.
4 Solid ball of positive materials with electrons scattered throughout. (Plum Pudding Model). This model was proposed by JJ Thomson in 1904. That the atom contained a large positively charged ball with negative charges scattered about.
3 # The atom is mostly empty space. A dense nucleus with protons and neutrons is in the center and electrons travel around it randomly. This model was proposed by Ernest Rutherford in 1911. The center of the atom was dense and positively charged with protons and neutrons surrounded by electrons orbiting it and most of the space between the nucleus and the electron orbit empty.
2 A dense nucleus with protons and neutrons is in the center of the atom. The electrons travel around the nucleus in distinct energy levels. This model was proposed by Niels Bohr in 1913. This was due to the fact that atoms only emit light at certain wavelengths which would imply that they have discrete energy levels which the electrons are contained in.
Сл A dense nucleus with protons and neutrons in the center of the atom. The electrons are found in "electron clouds" which surround the nucleus. Electron cloud show where electrons are likely to be, but not exactly where they are. This model was proposed by Erwin Schrodinger in 1926 through the solution of the Schrodinger wave equation. The position of the electron is assumed to to be a probability in an electron cloud.
which refers to the distance between two crests or two troughs on a transverse wave?
wavelength
amplitude
frequency
hertz
Answer:
wavelength
Explanation:
the definition of wavelength is the distance from one Crest to the next crest,or one trough to the next trough
The phenomenon that refers to the distance between two crests or two troughs on a transverse wave is wavelength.
What is wavelength?Wavelength is simply defined as the distance between successive crests of a wave, particularly in a sound.
In conclusion, wavelength refers to a traveling particle.
Read more about Wave
https://brainly.com/question/3004869
what does boiling point mean?
Answer:
The temperature at which a liquid boils and turns to vapor.
Explanation:
Boiling point, temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure exerted by the vapour of the liquid; under this condition, addition of heat results in the transformation of the liquid into its vapour without raising the temperature. therefore the water is at its boiling point.
Answer:
When a substance starts to boil, like 212° F, that is considered boiling point.
How to do p=hdg
I don’t understand it all please help
What does Newton's third law describe?
A. Equal and opposite forces
B. How the amount of mass influences the amount of force needed
to move an object
C. The tendency of moving objects to stay in motion
D. The attractive force between two objects due to their masses
Suppose a pendulum starts with a potential energy of 100 J. Assuming the pendulum has a height of 0 m at the bottom of its swing, what is its maximum kinetic energy?
Answer:
100...................
Why would someone burn signs in the fire place?
Answer:
maybe the sign says something mean
Explanation:
you throw a snowball horizontally. it hits a target 2 meters away. you notice that it hit .9 m below were u aimed. with what horizontal velocoty did you throw the ball
Answer:
The target is 2 meters ahead of you.
If you throw the snowball with a velocity S, then the time that the snowball will need to hit the target is:
2m/S = T
Now let's analyze the vertical problem.
The only force acting on the snowball is the gravitational force, then the acceleration will be -g = -9.8m/s^2.
a(t) = -9.8m/s^2
For the vertical velocity, we need to integrate over time and get:
v(t) = (-9.8m/s^2)*t + v0
Where v0 is the initial vertical velocity, in this case is zero because the ball is thrown horizontally.
v(t) = (-9.8m/s^2)*t
For the vertical position, we integrate again over time.
p(t) = (-4.9m/s^2)*t^2 + p0.
Now, we know that when the ball hit the target, it hits 9 meters below the desired point (where the desired point is p0), so p(2m/S) = p0 - 9m.
Then we have:
(-4.9m/s^2)*(2m/S)^2 = -9m.
We need to solve this for S.
(-4.9m/s^2)*4m^2/-9m = S^2
2.178 m^2/s^2 = S^2
√(2.178 m^2/s^2) = S = 1.48 m/s
The horizontal velocity is 1.48 m/s
How plants are in the
Solora System
Answer:
there was 9 but pluto got kicked out of the solar System so 8
a car travels 200m in 30 s and 400m in the next 90s. Whats the average speed?
Answer:
300m per minute or 5m per second
Momentum is usually not exactly conserved in a real world demonstration of momentum conservation. What is a possible reason for this fact?
Answer:
For any collision occurring in an isolated system, momentum is conserved. The total amount of momentum of the collection of objects in the system is the same before the collision as after the collision.
Explanation:
Hope this helps
You are given directions to a friend’s house from your school. They read: “Go east one block, turn north and go 4 blocks, turn west and go 1 block, then go south for 2 blocks.” Using your school as the origin, draw a map of these directions on a coordinate plane. What are the coordinates of your friend’s house?
Answer:(0,2)
Explanation:
Take origin (0,0) as point A and when you move one block east to point B then coordinates becomes (1,0)
Now you move 4 blocks north to point C then the coordinates of point C becomes (4,1)
Similarly, You move 1 block west to point D such that its co-ordinates becomes (0,4)
Finally you move from D to E, 2 blocks south such that point E becomes (0,2)
So, E is the friend's house and its coordinates are (0,2)
It can be diagramatically be represented by figure given below
Is it true to say there are forces acting on an object that is traveling at 20 m/s in a
straight line?
Answer:
Its true i think
Explanation:
Sorry if it’s blurry. Please help. I can’t mess up.
answer:
MAXIMUM SPEED
explanation:
IM SURE THAT IS THE ANSWER
The gland which is like a medium for the passage of the sperms is known as
Answer:
seminal glands or vesicular glands
The mining-resource cycle determines the use of ore materials. Which step is not part of the cycle?
A)
exploring and extracting ores
B)
refining ores and creating products from ore materials
C)
marketing and selling products that use ore materials
D)
recycling and disposing of wastes from the steps and the products
Answer:
c) marketing and selling products that use ore materials
what definition of a compresssion is correct?
A. region of high altitude in a medium caused by a passing wave
B. region of high pressure in a medium caused by a passing wave.
C. region of low pressure in a medium caused by a passing wave.
D. region of zero pressure in a medium caused by a passing wave
Answer:
B
Explanation:
Compression is the region of high pressure in a medium caused by a pressure wave.
What is Compression?When a physical force presses inward on an object, causing it to become compacted, that is when compression force (also known as compressive force) happens. The atoms and molecules of the item move around in relation to one another throughout this process. Depending on the kind of material receiving the compressive stress, this change may be either temporary or permanent. Depending on the direction or location of the compressive force imparted to the object, other outcomes may also ensue.According to Newton's Third Law of Motion, there is an equal and opposite reaction force for every action force. Both ends of an object that is lying on a surface are subjected to the same amount of compression force.The physical shape of the spring gets compacted as compression force is applied to it. The spring immediately extends outward and returns to its original shape when the compression is released. This can be a dynamic reaction, depending on the amount of force used and the spring's own malleability.To learn more about compression, refer to https://brainly.com/question/7602497
#SPJ2
what caused earths continents to drift apart?
Answer:
bada bop boop pow
Explanation: