Answer:
800 N upward
Explanation:
In order for the man to be able to stand up in the chair, the force would have to be the same as his weight (800 N) pushing in the opposite direction. So, if he is pushing down by standing on it than the force, 800 N, would be pushing upwards.
Describe your observations about the mid-ocean ridge. What did it look like? How do you think it got there?
(subject science)
Giving Brainliest
Select the correct answer.
An object is acted upon by a force of 22 newtons to the right and a force of 13 newtons to the left. What is the magnitude and direction of th
net force?
Answer:
9N
Explanation:
net force = right force - left force
net force = 22 - 13=9N
Which statement is true about the thermal energy of an object? Choose the correct answer. 1). Thermal energy is the internal potential energy of an object. 2). Thermal energy is the heat that is transferred in and out of an object. 3). Thermal energy is the sum of kinetic and potential energy of an object. 4). Thermal energy is the internal kinetic energy of the molecules of an object.
helpppppppp pleaseeeee
A. 7cm
B. 24cm
C. 18cm
D. 63cm
Answer:
A. 7cm
I hope it helps...
On Planet Y, which has no air, a dropped object falls 9 m in 3 seconds. What is g, the acceleration due to gravity, on that planet?
9.8 m/s2
3 m/s2
2 m/s2
Answer:
a = 2 m/s^2
which agrees with the third answer option provided.
Explanation:
Recall the kinematic formula for displacement under the action of a constant acceleration "a":
yf - yi = 1/2 a t^2
using the information provided this equation becomes:
9 = 1/2 a (3)^2
solve for a:
9 * 2 / 9 = a
then a = 2 m/s^2
which agrees with the third answer option provided.
if there's air in a ball and it bounces how come a room doesn't bounce
Answer:
Funny answer but works!
Explanation:
Not enough air. Go outside, crack open the window and blow air into the room like you would a balloon then close the window quickly. If it doesn't start bouncing, try giving the house a push. Good luck.
You are pushing a 30kg box down the hall. There is 20 N friction force acting against you, but you still manage to accelerate the box at 2.0m/s2 (squared) What force are you applying?
Answer:
Thrust?
Explanation:
1. A wave with a frequency of 10 Hz has a wavelength of 3 meters. At what
wave speed will this wave travel?
Answer:
30 m\ s Ans .....
Explanation:
Data:
f = 10 Hz
w = 3 m
v = ?
Formula:
v = fw
Solution:
v = ( 10)(3)
v = 30 m\ s Ans ........
There is a bell at the top of a tower that is 45m high. The bell mass is 190. Calculate its potential energy.
Answer:
83790 J.
Explanation:
Potential Energy: This can be defined as the energy possessed by a body, by vitue of it position in the gravitational field. The S.I unit of Potential Energy is Joules (J).
From the question,
P.E = mgh........................................... Equation 1
Where P.E = potential Energy of the bell, m = mass of the bell, h = height of the tower, g = Acceleration due to gravity.
Given: m = 190 kg, h = 45 m.
Constant: g = 9.8 m/s²
Substitute these values into equation 1
P.E = 190×45×9.8
P.E = 83790 J.
Hence the potential energy of the bell is 83790 J.
What velocity must a 2 kg toy car have the same momentum as a 4 kg toy car traveling at a velocity of 3 m/s west?
Answer:
6kg m/s west
Explanation:
pls answer if u know the answer ^w^ thx!
Friction _____.
A) is always and unwanted force
B) works in the opposite direction of motion
C) causes machines to work 100 percent efficiently
D) can be increased using lubricants, like oil
Answer:
works in the opposite direction of motion
Which statement best shows that waves carry energy?
You feel vibrations if loud sounds are played.
Light shining through some trees makes shadows.
Answer:
light shining through some trees makes shadows
Answer:
it is option 1
Explanation:
it is because is vibrations are caused due to disturbance in air column and for this to have u need energy
If we could easily create machines or systems with no friction, what could we use them for?
If we did use zero-friction machines for these purposes, how would our everyday lives change?
Answer:
We could make a frictionless generator.
Explanation:
This would change life by making the cost for energy next to zero
Why do scientists include a disclaimer about the "actual" number of characteristics that quantify life? Choose the best answer.
There are still many factors about life being studied and discovered.
Some of the characteristics may not be true.
Answer:
this is the answer
Explanation:
There are still many factors about life being studied and discovered
The Moon has a mass of 7.35 * 1022 kg, and a radius of 1.737 * 106 m. Based on
these values, what is the acceleration due to gravity on the surface of the Moon?
Answer:
1.63 [tex]ms^{-2}[/tex]
Explanation:
The equation [tex]g = \frac{G*M}{R^2}[/tex] would be used where:
g = acceleration due to gravity
G = universal gravitational constant (6.67408 × [tex]10^{-11}[/tex] [tex]m^{3} kg^{-1} s^{-2}[/tex])
M = mass
R = radius.
assuming the values following both 10s of the mass and radius are their exponents, which is a little confusing, the values given would simply be substituted.
Anyone can correct me if I'm wrong.
The cars on an amusement-park ride travel at a
constant velocity of 4.0 m/s on a circular track
that has a radius of 4.0 m. What is the
magnitude of each car's centripetal
acceleration?
A 1.0 m/s2
B 2.0 m/s2
C 4.0 m/s2
D 16 m/s2
Answer:
C) 4.0 m/s²
Explanation:
Centripetal acceleration can be found by the formula
a = v²/rWe are given the velocity of the car, 4.0 m/s.
We are also given the radius of the circular track, 4.0 m.
Substitute these values into the formula.
a = (4.0)²/4.0 a = 16.0/4.0 a = 4.0The magnitude of each car's centripetal acceleration is C) 4.0 m/s².
You are trying to gain possession of the soccer ball. What position are you playing?
a. both offense and defense
b. neither offense or defense
c. offense
d. defense
Answer:
a
Explanation:
Answer:
it's d. Defense
defense
Explanation:
yes
List three conditions for current to flow in a circuit.
Clayton tries to build an electric circuit using a battery, a light bulb, a paper clip, and copper wire. The diagram below shows what he builds.
Which claim best explains why the circuit would not conduct electricity?
a. The circuit lacks a power source.
b. The circuit is not a complete loop
c. The light bulb uses the electric current.
d. The paper clip stops the electric current.
Answer: letter B
Explanation:
As you can see the battery only has one wire connected to it thus not a complete loop
its b trust me man ;oih wrio'weioa'yher
pls help need it NOW
Most of the mass of an atom is concentrated predominantly…
a=in the nucleus
b=in the electrons
c=in the neutrons
d=in the positrons
Answer:
A
Explanation:
A 1.50 kg rock is thrown up into the air from ground level, reaches a maximum height of 7.00 m, then returns to the ground. Calculate the rock's momentum as it strikes the ground
Answer:
17.565 kgm/s
Explanation:
Momentum = mass × velocity
I = mv..................... Equation 1
But we can calculate the value of v using the equation of motion under gravity.
v² = u²+2gs............. Equation 2
Where u = initial velocity, s = maximum heigth, g = acceleration due to gravity.
Given: u = 0 m/s (at the maximum heigth), s = 7.0 m.
Constant: g = 9.8 m/s²
Substitute these values into equation 2
v² = 0²+ 2×7×9.8
v² = 137.2
v = √137.2
v = 11.71 m/s.
Also given: m = 1.50 kg
substitute these values into equation 1
Therefore,
I = 1.5×11.71
I = 17.565 kgm/s
What types of human and animal behavior are "complex, unlearned, and rigidly patterned"?
Answer:
Instincts
Explanation:
instincts are complex, unlearned behaviors that are present throughout a species and genetically transmitted.
The wavelength of a sound wave is 30 m. The frequency is 7 Hz. What is the wave speed?
210 m/s
4.29 m/s
Answer:
210m/s
Explanation:
To find the speed of wave you need to multiply the wave length with the frequency.
example of natural magnet
Answer: lodestone
An example of a natural magnet is the lodestone, also called magnetite. Other examples are pyrrhotite, ferrite, and columbite.
Classification of Magnets
Lodestones are a common example of natural magnets. Artificial magnets – Artificial magnets can be produced by man-made means and have a stronger magnetic field. They can also be shaped as required. When an artificial magnet is shaped in the form of a bar, it is called a bar magnet.
Explanation:
A suitcase has mass of 4.1 kg and sits on a counter 1.8 m high in the airport. How much gravitational potential energy does it have?
Answer:
72.324 J
Explanation:
Formula for gravitational potential energy is given by;
GPE = mgh.
Where;
m = mass
g = acceleration due to gravity
h = height
We are given;
m = 4.1 kg
h = 1.8 m
Thus;
GPE = 4.1 × 9.8 × 1.8 = 72.324 J
Describe the importance of conservative forces to conservation of energy.
Answer:
IF a force is conservative, it is possible to assign a numerical value for the potential at any point and conversely, when an object moves from one location to another, the force changes the potential energy of the object by an amount that does not depend on the path taken, contributing to the mechanical energy and the .
Explanation:
Can someone help me pls!!
Answer:
Decelerating
Explanation:
One arrow is moving it forward but the other arrow is using more force to move it backwards causing it to have a reduction in speed.
give one
excemple where friction is a
hindrance
1) In machines, efficiency reduces due to friction has energy may be lost as heat. 2) When one falls and slides over rough surface like cement, then the injury caused is more.
If Wile E. Coyote had enough money to buy all that ACME stuff, why didn't he just buy dinner?
Answer:
I dont know but nice question
Explanation:
I laughed super hard when I saw this