Answer:
1200
Explanation:
a = 1.5 m/s2
F = 1800N
M =?
F = Ma
M = F/a = 1800/1.5 = 1200Kg
What is the normal force exerted by the ground on a 65-kg metal bar?
-640 N
640 N
-65 N
Answer:
640N
Explanation:
Mass of a metal bar, m = 65 kg
We need to find the normal force exerted by the ground on the bar.
The normal force on an object acts in upward direction. The magnitude of normal force is equal to its weight.
N= mg
Put m = 65 kg and g = 9.8 m/s²
N = 65 × 9.8
= 637 N
or
N = 640 N
Hence, the normal force is 640 N.
A 2kg rock is moving at a speed of 6m/s. What constant force is needed to stop the rock in 7 x 10^-4?
Explanation:
key to this problem is the impulse-momentum theorem which states that the change in the momentum of an object is equal to the impulse applied into it.
J
=
Δ
p
,
where
J
is the impulse and
Δ
p
is the change in momentum. Basically, the impulse is the product of force and time duration, that is,
J
=
F
Δ
t
In this problem, the impulse would be the product of the force stopping the rock and
0.7
s
.
On the other hand, momentum
p
is the product of the mass
m
and velocity
v
. Therefore, the change in momentum is given by
Δ
p
=
m
2
v
2
−
m
1
v
1
.
Starting with the impulse-momentum equation, we have
J
=
Δ
p
F
Δ
t
=
m
2
v
2
−
m
1
v
1
Divide both sides by
Δ
t
,
we get
F
Δ
t
Δ
t
=
m
2
v
2
−
m
1
v
1
Δ
t
F
=
m
2
v
2
−
m
1
v
1
Δ
t
Finally, substitute the values and we get
F
=
(
2
kg
)
(
0
)
−
(
2
kg
)
(
6
m
s
)
(
0.7
s
)
F
≈
−
20
kg
m
s
2
Since
1
N
=
1
kg
m
s
2
,
then
F
≈
−
20
N
Therefore, using the correct significant figures (in this case, we need one significant figure since 2 kg, 6 m/s and 0.7 s all have one) in the final answer, we would need to have approximately
20
N
force to stop the rock in
0.7
s
.
Note: The negative sign is referring to the direction of the force opposite of the direction of the velocity
v
1
.
A storm cloud has a charge of 0.055 C. Due to polarization, the top of a tree gains a charge of -0.006 C. The cloud moves to 98 meters above the tree. Find the amount of force between the cloud and the tree rounded to two decimal places.
Answer:
F = 309.24 N
Explanation:
Given that,
Charge on a strom cloud, q₁ = 0.055 C
The charge gained by the top of a tree, q₂ = -0.006 C
The cloud moves to 98 meters above the tree.
We need to find the amount of force between the cloud and the tree. The electrical force between two charges is given by :
[tex]F=\dfrac{kq_1q_2}{r^2}\\\\F=\dfrac{9\times 10^9\times 0.055\times 0.006 }{(98)^2}\\\\F=309.24\ N[/tex]
So, the force between the cloud and the tree is equal to 309.24 N.
Two carts with masses of 14.7 kg and 3.2 kg
move in opposite directions on a frictionless
horizontal track with speeds of 6.7 m/s and
3.1 m/s, respectively. The carts stick together
after colliding head-on.
Find their final speed.
Answer:
Speed, V = 4.95m/s
Explanation:
Given the following data;
Mass, M1 = 14.7kg
Mass, M2 = 3.2kg
Velocity, V1 = 6.7m/s
Velocity, V2 = 3.1m/s
To find the final speed;
Mathematically, inelastic collision is given by the formula;
[tex] V = \frac{(M_{1}V_{1}+M_{2}V_{2})}{(M_{1}+M_{2})}[/tex]
Where;
V is the final velocity in m/s.
M1 is the mass of the first object in kgs.
M2 is the mass of the second object in kgs.
V1 is the initial velocity of the first object in m/s.
V2 is the initial velocity of the second object in m/s.
Substituting into the equation, we have;
[tex] V = \frac{(14.7*6.7) - (3.2*3.1)}{14.7 + 3.2}[/tex]
[tex] V = \frac{98.49 - 9.92}{17.9}[/tex]
[tex] V = \frac{88.57}{17.9}[/tex]
Speed, V = 4.95m/s
Can someone help me with these two please.
Jimothy is riding his bike to his friend's house. He decides to see how fast he can go, and starts pedaling as hard as he can. He began with an initial velocity of 2.5 m/s. He pedals with an acceleration of 1.5 m/s^2 for a time of 6 seconds. Calculate his final velocity.
Answer:
Final velocity, V = 11.5m/s
Explanation:
Given the following data;
Initial velocity, U = 2.5m/s
Acceleration, a = 1.5m/s²
Time, t = 6secs
To find the final velocity, we would use the first equation of motion
V = U + at
Substituting into the equation, we have
V = 2.5 + 1.5*6
V = 2.5 + 9
Final velocity, V = 11.5m/s
how does density affect the pressure of a liquid?
Anyone plz answer
Answer:
As the density of the liquid increases, so does the pressure. If the liquid is open to the air, there will also be atmospheric pressure on its surface.
Explanation:
If the man has initial velocity of 0.4 m/s, acceleration is 0.343 m/s^2, a time of 5.8 seconds, and experimental final velocity of 2.4 m/s? What is the calculated final velocity?
Group of answer choices
2.15 m/s
2.39 m/s
3.25 m/s
3.49 m/s
Answer:
The answer is going to be C.
Explanation:
Trust me. Im an expert in physics
.
What is one common cause of farsightedness?
a cornea that is not curved enough
an iris that cannot contract
a cornea that is too curved
an eyeball that is too long
Answer:
a cornea that is not curved enough
Answer:
a cornea that is not curved enough
Explanation:
Or in other terms a cornea that is too flat.
How much work do you do, when you lift a 155 n child .8 m?
Answer:
1240j I think this is the answer
GIVING BRAINLIEST !
answer quick !!!!!
What is the mass of a 1000 N person on Ea
Answer:
225-Ib person weighs 1000 N
The neighborhood joker comes up to you and is really on a roll this morning. After several “good ones” they then say “OK so you’re taking physics, right? Here’s one – if the acceleration of gravity is 9.8 m/s2 then why isn’t everything accelerating? HAHAHA”. Being a dedicated student you give this question some real thought and come up with a reasonable response. You might say:
GRAVITY IS DEPENDENT UPON *
A. Mass and Newton’s
B. Newton’s and Pounds
C. Distance and Mass
D. Distance and Liters
Answer:
C......................
Please answer the question for gravitational field attached in the image.
We are given:
Radius of Venus= 6 * 10⁶ m
Height above the planet's ground = 9.4 * 10⁶ m
Mass of Venus = 4.867 * 10²⁴ kg
Finding the Gravitational Field:
We first need to calculate the distance between the center of masses
Distance between center of masses:
Since the point is above the surface of Venus, the radius of Venus and the height will add
Distance between the center of masses = 9.4*10⁶ + 6 * 10⁶
Distance (r) = 15.4 * 10⁶ m
Now back to Gravitational field!
We know the formula for Gravitational Field:
g = GM / r² [where g is the gravitational field, M is the mass of the planet, r is the distance between the center of masses and G is the gravitational constant]
plugging the known values in the formula:
g = (6.67 * 10⁻¹¹ * 4.867 * 10²⁴) / (15.4*10⁶)² [G = 6.67*10⁻¹¹ Nm²/kg²]
g = (32.46 * 10¹³) / (237 * 10¹²)
g = (32.46 * 10¹³) / (23.7 * 10¹³)
g = 32.46/23.7 [the 10¹³ got cancelled out]
g = 1.367 N/kg² (or m/s²)
How long does it take for the moon to orbit around the Earth?(no copied answer)
Answer:
27 days it take for the moon to orbit around the Earth8th grade science /collisions
Answer:
C
Explanation:
Describe how electromagnetic waves are formed and travel through space.
Answer:
as it travel through the space it behave like a wave and has an oscillating electric field components and an oscillating magnetic field
Electromagnetic waves are created by a charged particle that generates an electric field. The electric field creates a magnetic field. As the charged particle moves, the electric field and magnetic field keep changing, which causes the wave to move.
BRAINLIST
A particular spring has a spring constant of 25 N/m.
Calculate the energy stored when the spring is extended by 15 mm.
Give your answer in standard form, to 3 significant figures.
Answer:
2.8×10^-3[tex]e.p.e = \frac{1}{2} k {x}^{2} \\ = \frac{1}{2} \times 25 \times (0.015m)^{2} \\ = 0.0028125[/tex]
0.0028125N
When making a DNA Fingerprint, the job of the restriction enzyme is to..
A.)isolate the DNA from a sample of cells
B.)cut a DNA sample into fragments
C.)make millions of copies of DNA fragments
D.)separate DNA pieces by size
Answer:
A isolate the DNA From a sample of cells
What is the constant for universal gravitation
Answer:
G is called the constant of gravitation and is equal to 6.67 × 10−11 newton-metre2-kilogram−2.
Explanation: I hope this helps* pls mark me brainliest*
TIMED! URGENT! REALLY APPRECIATE HELP!! TYSM!!!!!!
While on a weekend trip to Austin, you walk around the city at 1.7m/s. How far will you have moved in 15.9s? *
27.03m
.589m
.589m/s
Answer:
d = 27.03 m
Explanation:
Constant Speed Motion
An object travels at constant speed if the ratio of the distance traveled by the time taken is constant.
Expressed in a simple equation, we have:
[tex]\displaystyle v=\frac{d}{t}[/tex]
Where
v = Speed of the object
d = Distance traveled
t = Time taken to travel d.
From the equation above, we can solve for d:
d = v . t
It's required to find the distance traveled by someone walking at v=1.7 m/s for t=15.9 s. Substituting in the last equation:
d = 1.7 m/s * 15.9 s
d = 27.03 m
which soap sample most likely took the longest time to dissolve
what’s the answer here? is it d or c i’m confused
Which of the following is the balanced equation of Photosynthesis?
CO2 + H2O → Co H12O6 + O2
6 CO2 + 6H20 — 6 C6 H12 06 + 6 O2
CO2 + 6H2O → 6 C6H12O6 + O2
6 CO2 + 6H2O → C6H12O6 + 6 O2
Explanation:
the last equation is the answer
6 CO2 + 6H2O → C6H12O6 + 6 O2
Which of the following combinations makes up an ionic compound?
A. A positive anion and a positive anion
B. A positive anion and a negative cation
O C. A positive cation and a negative cation
D. A positive cation and a negative anion
Answer:
D. A positive cation and a negative anion
Explanation:
An ionic compound is defined as the chemical compound formed by the combination of two charged particles or ions held together by electrostatic forces.
An ionic compound is made up of ions, a cation which is a positively charged ion and an anion which is a negatively charged ion. Example of ionic compounds are Lithium Fluoride, Lithium Iodide, and Sodium Bromide.
Hence, the correct answer is "D. A positive cation and a negative anion".
Name a characteristic physical property?
Q3. A large block of stone is held at a height of 15m having gained 4500J
of GPE. How much does it weigh (you are calculating mass!) ? Answer to
one decimal
place.
Answer:
[tex]gpe = mgh \\ = (mg)h[/tex]
(mg)= weight
[tex]pe = (mg)h \\ 4500 = 15(mg) \\ mg = 300n[/tex]
mg = 300N
If a large block of stone is held at a height of 15m having gained 4500J
of gravitational potential energy, then the weight of this large block of stone would be 300 Newtons.
What is mechanical energy?As total mechanical energy is the sum of all the kinetic as well as potential energy stored in the system.
ME = KE + PE
As given in the problem if a large block of stone is held at a height of 15m having gained 4500J of gravitational potential energy,
height = 15 meter
The gravitational potential energy of the block of stone is 4500J.
the total gravitational potential energy is given by the expression,
PE = mgh
4500 = mg×15
mg = 4500/15
= 300 Newtons
Thus, the weight of the large block of stone would be 300 Newtons
To learn more about mechanical energy from here, refer to the link;
brainly.com/question/12319302
#SPJ2
HELP ASAP THIS ASSIGNMENT LOCKS TODAY PLEASEEEE
Answer:
I'm going with a and y I dont want it to be wrong tho
Three dogs (Spot, Fido, and Steinberg) are pulling on a chew toy. The chew toy is experiencing no acceleration. Spot is pulling with a force of 30 Newtons directly South. Fido is pulling with a force of 20 Newtons at an angle of 63 degrees North of East. What are the magnitude and direction of the force that Steinberg is applying?
Answer:
The magnitude and direction of the force applied by Steinberg are approximately 15.192 newtons and 126.704º.
Explanation:
The chew toy is at equilibrium and experimenting three forces from three distinct dogs. The Free Body Diagram depicting the system is attached below. By Newton's Laws we construct the following equations of equilibrium: (Sp is for Spot, F is for Fido and St is for Steinberg) All forces and angles are measured in newtons and sexagesimal degrees, respectively:
[tex]\Sigma F_{x} = F_{F}\cdot \cos \theta_{F} + F_{St,x} = 0[/tex] (1)
[tex]\Sigma F_{y} = F_{F}\cdot \sin \theta_{F}-F_{Sp}+F_{St,y} = 0[/tex] (2)
If we know that [tex]F_{F} = 20\,N[/tex], [tex]F_{Sp} = 30\,N[/tex] and [tex]\theta_{F} = 63^{\circ}[/tex], then the components of the force done by Steinberg on the chewing toy is:
[tex]F_{St,x} = -F_{F}\cdot \cos \theta_{F}[/tex]
[tex]F_{St,x} = -(20\,N)\cdot \cos 63^{\circ}[/tex]
[tex]F_{St, x} = -9.080\,N[/tex]
[tex]F_{St,y} = F_{Sp}-F_{F}\cdot \sin \theta_{F}[/tex]
[tex]F_{St,y} = 30\,N-(20\,N)\cdot \sin 63^{\circ}[/tex]
[tex]F_{St, y} = 12.180\,N[/tex]
The magnitud of the force is determined by Pythagorean Theorem:
[tex]F_{St} = \sqrt{F_{St,x}^{2}+F_{St,y}^{2}}[/tex]
[tex]F_{St} =\sqrt{(-9.080\,N)^{2}+(12.180\,N)^{2}}[/tex]
[tex]F_{St} \approx 15.192\,N[/tex]
Since the direction of this force is in the 3rd Quadrant on Cartesian plane, we determine the direction of the force with respect to the eastern semiaxis:
[tex]\theta_{St} = 180^{\circ} + \tan^{-1} \left(\frac{F_{St,y}}{F_{St,x}}\right)[/tex]
[tex]\theta_{St} = 180^{\circ} + \tan^{-1} \left(\frac{12.180\,N}{-9.080\,N}\right)[/tex]
[tex]\theta_{St} \approx 126.704^{\circ}[/tex]
The magnitude and direction of the force applied by Steinberg are approximately 15.192 newtons and 126.704º.
explain how we connect a bulb in a circuit
pls give me a answer
Answer:
Connect one end of each wire to the screws on the base of the light bulb holder. ...
Connect the free end of one wire to the negative (“-“) end of one battery. ...
Attach the free end of the other wire to the positive (“+”) end of the battery.
Explanation: