Please help me with these calculating velocity questions im so stressed out
Answer: -10m/s
Explanation:
Velocity is solved using the equation displacement over time. Part C shows a displacement or change in x of 30 and a change in time of 3 secs (7-10) so the equation would be 30m/3s= -10m/s it is negative because look at the slope. Its decreasing right? So that means the objects is slowing down which means it can't have a positive velocity
A body moves with constant speed but has an acceleration. This is possible if it
Answer:
This is possible if it moves in a circle.
Explanation:
hope this helps and is right :)
p.s. i really need brainliest
What type of Circuit do they use in a home? WHY ? (Simple circuit / Parallel circuit / Series circuit)
Answer:
Parallel Circuits
Explanation:
Loads can be operated on their own. If you had a series circuit, adding another light would dim the rest!
______ tides, tides that are weaker than normal, happen when the Moon is at first or last quarter phase and the sun and moon interfere with each other.
A high
B low
C neap
D spring
Answer:
C. Neap Tides
Explanation:
Answer:
c neap tides
Explanation:
i need help in (a) and (c)
please at least try
I don't know please mark as brilliant
How long will it take for a basketball spinning on someone’s finger to stop if it undergoes and angular acceleration of -0.15 rad/s and is traveling at 27 rad/s initially? How many revolutions will it make?
The basketball's angular velocity ω at time t is
ω = 27 rad/s + (-0.15 rad/s²) t
It comes to a stop when ω = 0, which happens for
0 = 27 rad/s - (0.15 rad/s²) t
t = (27 rad/s) / (0.15 rad/s²)
t = 180 s
In this time, the ball would undergoes an angular displacement θ of
θ = (27 rad/s) t + 1/2 (-0.15 rad/s²) t ²
Plug in t = 180 s and solve for θ :
θ = (27 rad/s) (180 s) - 1/2 (0.15 rad/s²) (180 s)² = 2430 rad
One complete revolution corresponds to a turn of 2π rad, so the ball makes
(2430 rad) / (2π rad/rev) ≈ 386.747 rev
or about 387 revolutions as it slows down.
Which magnets need electric current for magnetism?
Answer:An electromagnet is a magnet that works with electricity. It can be switched on and off. The coils are nearly always made of copper wire because copper is such an excellent electrical conductor. Electromagnets have many uses.Permanent magnets are mainly used in small generators, and they have the advantage that they don't need a power supply. Electric magnets are iron or steel wound with wire. When electricity passes through the wire, the metal becomes magnetic and creates a magnetic field.
Explanation:
The atomic number is always equal to the total number of which is also equal to the total number of
Answer:
Protons; electrons.
Explanation:
An atom can be defined as the smallest unit comprising of matter that forms all chemical elements. Thus, atoms are basically the building blocks of matters and as such defines the structure of a chemical element.
Generally, these atoms are typically made up of three distinct particles and these are protons, neutrons and electrons. All the physical properties of a mineral result from the mineral's internal arrangement of atoms.
The atomic number is always equal to the total number of protons, which is also equal to the total number of electrons. Protons are the positively charged particles that make up an atom while electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.
A chemical element is denoted by [tex] X_{Z}^{A} [/tex]
Where;
X is the symbol of the element.
A is the atomic mass or number of nucleons.
Z is the atomic number or number of protons.
Therefore, the number of neutrons = A - Z
Save
a
A
Question 1
Which of the following is the most accurate description of the relationship between velocity and acceleration?
Velocity and acceleration are the same thing.
O
Velocity is a type of acceleration.
Acceleration is a change in velocity.
Acceleration is positive and velocity is negative.
Question 2
An object that is undergoing a change in velocity is said to be-
Answer:
response
Explanation:
Acceleration is your changing Velocity. An object that is ACCELERATING is experiencing a change in velocity. usually positive. if an object such as a car reduces velocity, it is called deceleration
3 examples of newtrons 2 law
Explanation:
1) Kicking a ball.
2) Capture the ball by hand.
3) Push a car.
The faster an object moves:
A the more potential energy it has.
B the more kinetic energy it has.
C the faster its particles vibrate.
D the cooler it gets.
Answer:
b the more genetic energy
A t-shirt cannon is fired into a crowd at a baseball game. The t-shirt with mass 0.17kg is fired, and the launcher (2.7kg) recoils at 1.7 m/s. Calculate the launch velocity of the t-shirt. Answer to 2 decimals
Answer:
Exactly 27 m/s
Explanation:
P=mv
P(cannon)=2.7*1.7
P(cannon)=4.59 kg*m/s
P(cannon)=P(tshirt)
4.59=0.17*v
v=27 m/s
the thumb is what to the phalanges?
Answer:
A thumb only has one joint and two phalanges. The thumb is referred to as “the big finger".
Brainlist pls!
Help pwease and tanks >:|
Answer:
B
Explanation:
Cause I think it is
West
East
<
디
50 Newtons
40 Newtons
What is the net force on the box?
А
10 Newtons West
B
10 Newtons East
с
90 Newtons West
D
90 Newtons East
If a ball is rolling down a hill, it has both kinetic and potential energy. The ball has
38 J of potential energy because of its height and 80J of kinetic energy because
of its motion. How much mechanical energy does the ball have
The answer is 118 J :)
Explanation:
38 +80 = 118.
PLEASE HELP ME!!! IREALLY NEED IT AND I WILL MARK BRAINLIST IF YOU ANSWER CORRECTLEY!!! mass of 0.22kg is oscillating on the planet Tatooine at a small angle from a light string of length 0.30m, with a period of 0.90s. What is the acceleration of gravity on Tatooine?
Answer:
The correct answer is 1.3Hz
Answer:
15 m/s
Explanation:
0.3 + 0.2 = 0.5
0.5 * 10 = 5
5 + 10 = 15
When a large truck pushes a small car with a given force, the small car is applying an _____and ____ force on the truck.
Answer:
Equal and opposite
Explanation:
Why is using fossil fuels considered unsustainable?
Answer:
Fossil fuels take millions of years to replenish
Answer:
Fossil Fuel is limited it is like coal there is a limit and it won't last forever. This also contributes that it is not safe for the environment as well as the safety and health of people. This is similar to when there are many factories around an area there is going to be a high percentage of respiratory diseases such as asthma.
Hurry up.
When a tight fitting lid is run under hot water, the lid _________ as the temperature increases. Question 3 options: Expands Melts Breaks Contracts
Answer:
expands
Explanation:
A 3.00 kg cart on a track is pulled by a string so that it accelerates at 2.00 m/s/s. The force of tension in the string is 10.0 N. What is the force of friction on the cart?
Answer:
If the track is horizontal and the string is pulled horizontally, the friction on the cart would be [tex]4.0\; \rm N[/tex].
Explanation:
Let [tex]m[/tex] denote the mass of this cart, and let [tex]a[/tex] denote the acceleration of this cart.
[tex]m = 3.00\; \rm kg[/tex].
[tex]a = 2.00\; \rm m \cdot s^{-2}[/tex].
Apply Newton's Second Law to find the net force on this cart.
[tex]\begin{aligned}\text{Net Force} &= m \cdot a\\ &= 3.00\; \rm kg \times 2.00\; \rm m\cdot s^{-2}\\ &= 6.00\; \rm N\end{aligned}[/tex].
The following forces act upon this cart:
(downward) gravitational attraction from the earth,(upward) normal force from the track,(forward) tension from the string, and(backward) friction from the track.Assume that the track is horizontal, and that the string was pulled horizontally. The normal force from the track would exactly balance the downward gravitational attraction from the earth. Hence, the [tex]6.00\; \rm N[/tex] net force on this cart would be equal (in size) to the size of the tension from the string ([tex]10.0\; \rm N[/tex]) minus the size of the friction from the track.
In other words:
[tex]\begin{aligned}&\text{Size of Net Force}\\ &= \text{Size of Tension} - \text{size of friction}\end{aligned}[/tex].
[tex]\begin{aligned}& 6.00\;\rm N = 10.0\; \rm N - (\text{size of friction})\end{aligned}[/tex].
[tex]\text{size of friction} = 10.0\; \rm N - 6.00\; \rm N = 4.0\; \rm N[/tex].
A liquid has a specific heat of 9 J/g • °C and a solid has a specific heat of 3 J/g • °C. Which
substance, the solid or liquid will heat up faster? Which will cool down faster?
Explanation:
substances have been in direct sunlight for up to 60 minutes. ... cool the fastest? ... 0.60 J/g °C. Match & then label each substance with its specific heat capacity ...
The engine of a 550kg car is producing a net force of 11,000N. What is its acceleration?
Answer:
Yeda
Explanation:
yshyei5rexwu drift hai used thakare I exam rest watu testing reddy
Answer:
20
Explanation:
(correct me if im wrong)
F = m×a
11000 = 550 × a
11000/550 = a
Acceleration =20
The net force of two forces F1 and F2 acting in the same direction is 85N.And if is 15N when they are exerted in opposite directions. Find the magnitudes of F1 and F2
An archer uses 2000J of energy to pull a bow string 0.15m. What is the force constant (k) of the bow string?
The spring constant of the given bow spring is equal to 1.77 × 10⁵ N/m.
What is Hooke's law?Hooke's law can be described as a law that states that the force (F) required to extend or compress a spring by displacement linearly with respect to that displacement along a straight line.
The spring force can be represented in the form of an equation:
F = -kx
where k is a spring constant of the spring and x is the deformation of the spring. The negative sign shows that force is restoring force.
The energy that can be stored in the spring when it is stretched is given by:
E = (1/2)kx²
Given, the energy stored in the spring when it is stretched, E = 1000J
The distance by which the bow spring is stretched, x = 0.15 m
2000 = (1/2) × k (0.15)²
k = 1.77 × 10⁵ N/m
Learn more about Hooke's law, here:
brainly.com/question/13348278
#SPJ2
guys pls help which one is it
Answer:
a mixture
since it had the power to separate as the question says
A weightlifter lifts a set of weights a vertical distance of 2.0 m. If a constant net force of 350 N is exerted on the weights, what is the net work done on the weights?
Answer:
700 Joules
Explanation:
The work done equals force times distance. Just multiply your two values there.
Side note: It would be more impressive if he'd done it in 1 second rather than 5. You know why? Because POWER=WORK/TIME. The less time it takes him to lift the weight with the same force and distance, the more powerful he is!
PLS HELP!! I will make brainliest!!
Which process is an example of a chemical reaction?
a. an iron nail rusting
b. bath water cooling while you take a bath
c. a piece of metal being heated until it expands
d. a glass window breaking when hit with a baseball
Answer:
Rusting!
Explanation:
Rusting is a chemical reaction because it is the process of oxidation of a metal.
Answer:
rusting
Explanation:
A force of 900 N pushes a wedge 0.10 m into a log. If the work done on the log is 50 J, what is the efficiency of the wedge?
HELPPPP
Answer:
55.56%
Explanation:
We'll begin by calculating the work done in pushing the wedge. This can be obtained as follow:
Force (F) = 900 N
Distance (s) = 0.1 m
Workdone (Wd) =..?
Wd = F × s
Wd = 900 × 0.1
Wd = 90 J
Finally, we shall determine the efficiency. This can be obtained as follow:
Work output = 50 J
Work input = 90 J
Efficiency =?
Efficiency = work output / work input
Efficiency = 50 / 90 × 100
Efficiency = 55.56%
Thus, the efficiency is 55.56%
What does it mean with the car accelerates but in the opposite direction of the car?
Answer:
When an object slows down, its acceleration is opposite to the direction of its motion. This is known as deceleration.
Explanation: