Answer:
Vf = - 3 [m/s]
Explanation:
To solve this problem we must use the following equation of kinematics.
[tex]v_{f} =v_{o} +a*t[/tex]
where:
Vf = final velocity [m/s]
Vo = initial velocity = - 7 [m/s]
a = acceleration = 1 [m/s²]
t = time = 4[s]
Now replacing:
Vf = -7 + (1*4)
Vf = - 3 [m/s]
I WILL GIVE BRIANLIEST!!!!!
Choose all the answers that apply.
Which of these statements are true?
A hypothesis is the conclusion of an experiment.
Observation is usually the first step in scientific method.
Dependent and independent variables are the same in an experiment.
Scientists try to understand the phenomena that occur in the environment.
Bias is a judgment that is not based on fact.
Answer:
Observation is usually the first step in scientific method
Scientists try to understand the phenomena that occur in the environment.
A locomotive starts from rest and accelerates at 0.12 m/s^2 to a speed of 2.4 m/s in 20 s. This motion could best be described as
A.) constant acceleration and constant velocity
B.) increasing acceleration and constant velocity
C.) constant acceleration and increasing velocity
D.) increasing acceleration and increasing velocity
Answer:
C
Explanation:
Which statement best describes covalent bonding?
A. Two nonmetal atoms share electrons between them.
B. Two metal atoms share electrons between them.
C. Many atoms give up electrons that can move among the atoms.
D. A metal atom transfers electrons to a nonmetal atom.
Answer:
A. Two nonmetal atoms share electrons between them
General Formulas and Concepts:
Chem
Covalent Bonding: between 2 nonmetalsIonic Bonding: between a metal and a nonmetalMetallic Bonding: between 2 metalsExplanation:
Covalent bonds are the ones between 2 nonmetal elements. Covalent bonding has 2 subcategories: Nonpolar Covalent and Polar Covalent.
An object travels in a straight line for 1200 m at a velocity of 50 m/s, what is its time of travel?
Given that,
distance = d = 1200m
velocity/speed = s = 50m/s
time = t
Also,
s = d/t
And,
t = d/s
t = 1200/50
t = 120/5
t = 24
Therefore, it takes 24s to travel.
Answer: Therefore, the travel time of a car that travels 1200 meters at 50 m/s is 24 seconds.
Explanation:
An object travels in a straight line for 1200 m at a velocity of 50 m/s, what is its time of travel?
Data:
d = 1200 m
V = 50 m/s
t = ?
The formula for uniform motion is:
V = d/tWhere
V = speedd = distancet = timeWe clear the formula for time t:
t = d/v
t = (1200 m)/(50 m/s)
t = 24 s
Therefore, the travel time of a car that travels 1200 meters at 50 m/s is 24 seconds.
Which of the following non-metals is used as a lubricant in powdered form?
a) Sulphur
b) lodine
c) Graphite
d) Silicon
Answer:
Graphite.
Explanation:
Graphite: "a gray crystalline allotropic form of carbon which occurs as a mineral in some rocks and can be made from coke. It is used as a solid lubricant, in pencils, and as a moderator in nuclear reactors."
an electric motor converts electrical energy into what kind of energy?
A) potential
B) kinetic
C) stored
D) chemical
Answer:
B.) Kinetic energy.
Explanation:
A better answer would be mechanical energy, but they do not have that up there.
An electric motor converts electrical energy into kinetic energy. The rotational kinetic energy of the motor is its mechanical energy to work.
What is energy transformation ?Energy can neither be created nor be destroyed. However, it can be transformed from one form to the other. Hence, the total energy of a system is conserved.
The energy lost in one form is equal to the energy gained in another form. We are using many electrical devices all are working under the process of energy transformation.
In an electric motor, the electrical energy is converted to the rotational kinetic energy of the motor. It is used for mechanical work of the motor. The rotational kinetic energy make the motor rotating. Hence, option B is correct.
Find more on electric motor:
https://brainly.com/question/19798195
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PLS HELP!!!
where does energy go if work is done by a non-conservative force ?
Answer:
The energy changes
Explanation:
When an non-conservative force (for example friction, air resistance, applied force) does work on an object, the total mechanical energy (Ek+Ep) of that object changes. If positive work is done, then the object will gain energy. If negative work is done, then the object will lose energy.
Calculate the amount of horizontal force needed to make a 0.4 kg soccer ball accelerate at 250 m/s2when kicked.
Answer:
100N
Explanation:
Force = Mass x Acceleration
Force = 0.4 kg x 250 m/s2
Force = 100N
name the factors on which kinetic energy and potential energy depends
Answer:
The kinetic energy of an object depends on both its mass and its speed. Kinetic energy increased as mass and speed are increased. An objects gravitational potential energy depends on its weight and on its height relative to a reference point.
A horse is pulling a 50 kg sled with a horizontal force of 25 N. The force of friction in the opposite direction is 5 N. What is the horizontal acceleration of the sled
Its a bit confusing. Please answer.
Answer:
c is answer ...............
Question 10 (1 point)
When the student releases the water balloon, it swings forward. When the water balloon swings back, you can tell that the student expects the
water balloon to hit her face. Why does the water balloon not continue on and hit the student's face?
Answer:
It does not hit the students face because the speed of the balloon slows down as energy is lost through thermal.
Explanation:
Help!!
Remember W = mg, 1 kg = 2.2 lbs. S
1) If you have a 12 lbs. bag of potatoes what is its mass? What is its weight?
Answer:
5.5 KG is the mass
53.9 is the Weight
anybody got any answers???
Answer:
b? to a?
Explanation:
It converts mechanical energy to electrical.
Therefore, Option A is the correct answer
The unit of work is a derived unit.
Answer:
energy, work, quantity of heat. joule J
Velocity refers to an object’s _____ and direction.
example of third class Lever first class Lever and second class Lever
pregunta: como palancas ??
Answer:
wrench wheel barrow tweezers
Explanation:
if you weigh 100 pounds and pull 4 g's how much do you now weigh
Answer:
sill 100?
Explanation:
Please help!
Which of the following will increase the force needed to pull an object up a ramp?
A, Oiling the ramp
B. Reducing the angle of the ramp
C. Putting wheels underneath the object
D. Increasing the mass of the object
Answer:
I believe the answer is B. Reducing the angle of the ramp. ( sorry if wrong:)
Why do we use insulators if they prevent the flow of electricity?
Answer:
letterman is shooting the kids
We use insulators to avoid being electrocuted. electricians use rubber gloves to avoid shock. Cables are insolated with rubber so you can hold them without getting shocked even if it is plugged in.
A 700-kg car, driving at 29 m/s, hits a brick wall and rebounds with a speed of 4.5 m/s. If the car was in contact with the wall for 0.30 s, what force did the wall exert on the car during the collision?
Answer:
57166.6NExplanation:
Step one:
given data
mass=700kg
initial velocity u=29m/s
final velocity=4.5m/s
time t= 0.3second.
Step two:
The expression for the momentum is given as
FΔt=mΔv
make F subject of the formula
F=mΔv/Δt
Substitute our given data we have
F=700(29-4.5)/0.3
F=700*24.5/0.3
F=17150/0.3
F=57166.6N
the force is 57166.6N
Ana exerts a force of 20 N on a volleyball that has a mass of 0.15 kg. What is the force that the volleyball exerts on Ana?
0.15 N
20 N
19.85 N
20.15 N
Answer:
20 N
Explanation:
The question above is related to "Newton's Third Law of Motion." It states that every action is being opposed by a reaction of equal size but different direction.
The action force in the situation above is 20 N while the reaction force here is the one coming from the volleyball. So if the action force is 20 N then it's a common sense that the reaction force is also 20 N.
Thus, 20 N is the amount of force that the volleyball is exerting on Ana.
Answer:
the answer is 20 N
Explanation:
yw!!
What is the difference between physical & chemical changes?
Slate whether each is an example of a Physleat (P) or Chemteal (C) property
1. Arock's density
2. boiling point of Gatorade
3. ability of an old car to rust
4. red color of a pe apple
S ability of wood to ignite
8. bitler taste of a lemon
7. melting point of wax
8. hardness of marble
9. Luster (shininess) of gold
boiling point Gatoride
A force of 25 newtons moves a box a distance of 4 meters in 5 seconds.
The work done on the box is [___] Nm, and the power is [___] Nm/s.
h e l p
Answer:
100 Nm and 25Nm/s.
Explanation:
Given the following data;
Force = 25N
Distance = 4m
Time = 5secs
To find the workdone;
Workdone = force * distance
Substituting into the equation, we have;
Workdone = 25*4
Workdone = 100 Nm
To find the power consumed;
Power = workdone/time
Substituting into the equation, we have;
Power = 100/4
Power = 25Nm/s
The work done on the box is 100 Nm, and the power is 25 Nm/s.
Mohammad has been saving 8 each week. Today he spent 142 of the savings, and he now has 50 left. For how many weeks has he been saving?
Answer:
24 weeks
Explanation:
142+50=192
192/8=24
15 POINTS URGENT DUE IN 5 MINUTES :(
please don’t troll.
A. A woman hiked on a trail up a mountainShe slowed down as it became more steep. She stopped at the top to take in the view below. Then she continued on the trail and walked down the other side of the mountain.
B. A truck driver left a warehouse and drove on a highway at a constant speed before he stopped for lunch. To make up for lost time, he drove faster when he got back on the highway. He unloaded his haul and drove quickly back to the warehouse.
C. A woman drove her car up steep bill and stopped at a red lightWhen the light turned green she continued to drive up the rest of the hill until she reached the gas station. She stopped to buy gas and then drove down the other side of the hill towards her office.
D. A man ran in a race and accelerated steadily for the first hour. He then continued briefly at a constant pace while he had the lead. When other runners began to catch up he accelerated againHe then continued at a constant high speed. He became overtired and slowed down until he had to completely stop running.
Answer:
D now go to ur good life :)
Explanation:
Answer:
blah
Explanation:
blah
true or false communication is important in healthy relationship
Answer:
True
Explanation:
If two partners don't communicate they'll grow apart and it may lead to one or the other cheating.
Answer:true
Explanation:
In this chemical reaction, one or more atoms replaces a part of a
compound.
*
synthesis
decomposition
combustion
replacement
neutralization
Explanation:
If there are more reactants than products, it is a synthesis reaction. If oxygen is a part of the reactant, it is a combustion reaction. If one ion replaces another, it is a single replacement reaction. If there are two compounds in a reactant where cations switch, it is a double replacement reaction.
a shot is fired with a velocity 100m/s in a direction making an angle 60 degree with vertical. calculate its time flight, maximum height reached and its horizontal range
Answer:
#Horizontal component of 100m/s=100 sin60=50×(root 3)=50×1.732=86.6m/s
#Vertical component of 100m/s=100 cos 60°=100/2=50m/s
(¡) Maximum height it can reach=(v^2+u^2) /2a=0+(50^2) / 2×(-10)=125m
(¡¡) The time takes to reach the maximum height =2S/(u-v)=125×2/(50-0)=5s
(¡¡¡) Horizontal range=ut=86.6×5=433m
Explanation:
# At the highest point (vertical) velocity is zero
#Velocity (horizontal) remains constant
(¡)By v^2=u^2+2as equation
(¡¡)By S=1/2(u+v)t equation
(¡¡¡) S=ut therefore horizontal range=ut
do you think you know this???
Answer:
electrical energy into mechanical energy
