Answer:
c is correct option thanks to brainly
If you have a piece of brass and a piece of aluminurn that have the same volume, which will have a larger mass?
Answer:
the aluminum would have the most mass
if the boy and his bike actually had a mass of 40 kg instead of 50 kg how much force would it take for him to accelerate at 0.8 m /s2
please help will give 15 points plus brainless
Answer:
F = 32 [N]
Explanation:
To solve this problem we must use Newton's second law, which tells us that the sum of forces on a body is equal to the product of mass by acceleration.
∑F = m*a
where:
F = forces applied [N] (units of Newtons)
m = mass = 40 [kg]
a = acceleration = 0.8 [m/s²]
Now replacing:
[tex]F=m*a\\F = 40*0.8\\F = 32 [N][/tex]
The number of protons equals the atomic number. TRUE OR FALSE?
Answer:
true
Explanation:
The number of protons, neutrons, and electrons in an atom can be determined from a set of simple rules. The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons.
Find the mass of a bowling ball that has an acceleration of 95m/s2 and a force 25N.
Answer:
Force = Mass * Acceleration
25 = Mass * 95
Mass = 95/25
Mass = 3.8 kg
Answer:
I hope the above pic will help you
I will always help you understanding your assingments
have a great day #Captainpower:)
A roller coaster travels down a 120 m track in 12.5 seconds how fast does the roller coaster go
Answer:
9.6m/s
Explanation:
Using the equation S=d/t where s=speed, d=distance, and t=time
plug in the known variables
S=120m/12.5s
S=9.6m/s
A 20 kg crate initially at rest on a horizontal floor requires a 80 N horizontal force to set it in motion. Find the coefficient of static friction between the crate and the floor.
Answer:
The coefficient of static friction between the crate and the floor is 0.41
Explanation:
Friction Force
When an object is moving and encounters friction in the air or rough surfaces, it loses acceleration and velocity because the friction force opposes motion.
The friction force when an object is moving on a horizontal surface is calculated by:
[tex]Fr=\mu N[/tex] [1]
Where [tex]\mu[/tex] is the coefficient of static or kinetics friction and N is the normal force.
If no forces other then the weight and the normal are acting upon the y-direction, then the weight and the normal are equal in magnitude:
N = W = m.g
The crate of m=20 Kg has a weight of:
W = 20*9.8
W = 196 N
The normal force is also N=196 N
We can find the coefficient of static friction by solving [1] for [tex]\mu[/tex]:
[tex]\displaystyle \mu=\frac{Fr}{N}[/tex]
The friction force is equal to the minimum force required to start moving the object on the floor, thus Fr=80 N and:
[tex]\displaystyle \mu=\frac{80}{196}[/tex]
[tex]\mu=0.41[/tex]
The coefficient of static friction between the crate and the floor is 0.41
HELP ASAP
The Target employees are working hard to get the orders out to everyone. The employees need to move packages from the ground level to the top of the loading dock platform. As shown in Figure 1, the employee pushes the package up a ramp (you may assume friction is negligible). In figure 2, the employee lifts the package straight up from ground to the loading dock platform. In which case does the employee do more work on the box and why?
a
Lifting the box straight up, because the incline acts as a simple machine and reduces the force required
b
Lifting the box straight up, because it requires a larger applied force to lift it straight up
c
Pushing the box up the incline, because the force is applied for a longer distance
d
Neither method, because the work is the same in both cases, since using the ramp decreases the force by the same factor that it increases the distance
Answer:
I believe the answer is B
_______________ is the name for the permanent destruction and clearing of forests
Answer:
DeforestationExplanation:
__________________________________________________________
According to Vocal Media,
__________________________________________________________
Deforestation is the permanent destruction of forests in order to utilize the land or trees. Typically, deforestation is clearing a lot of trees without the intention of establishing future growth. Harvesting, forest fires, and insect infestations do not count as deforestation because the affected areas will eventually grow back.
__________________________________________________________
Hope this helps! <3
__________________________________________________________
Electric current passing through a wire produces _.
a
a magnetic field around the wire
b
a compass
c
geographic poles
d
a permanent magnet
Answer: Answer is A.
A magnetic field around the wire
Explanation:
What is this question
Ram travel 50metre on a straight road in 30second . hari covers the same distance on the same road in 45s . who has done more work ? who has more ? Explain in short
Answer:
The ram has done more work because the rate at which the ram work is 1.6m/s and Hari is 1.1m/s
please help me asdrtyuio
Answer:
9. The Sun's Gravity
10. The core is the densest layer
A material has a low resistivity. Which statement is the best prediction about
this material?
A. It is a conductor that allows charge to move freely through it.
B. It is a conductor that does not allow charge to move freely through
it.
C. It it an insulator that does not allow charge to move freely through
D. It is an insulator that allows charge to move freely through it.
Please help fast
Answer:A
Explanation:I’m taking the test rn and I got it correct
It is a conductor that allows charge to move freely through it.
What is Resistivity?Resistivity is a distinctive attribute of any material that may be used to compare different materials based on how well they conduct electric currents. Low conductivity is indicated by high resistance.
The Greek letter rho is frequently used to represent resistance, which is numerically equivalent to the resistance R of a wire-like specimen, multiplied by its cross-sectional area A, and divided by its length.
The ohm is the measurement of resistance. The ratio of area in square meters to length in meters is reduced to merely meters in the metre-kilogram-second (mks) method.
Therefore, It is a conductor that allows charge to move freely through it.
To learn more about resistance, refer to the link:
https://brainly.com/question/29427458
#SPJ5
3. A dog walks a distance of 100 ft. in 20 s of time. What is the dog's
speed in feet per second?
O C 120 ft/s
O B80 ft/s
O D 2000 ft/s
O A 5 ft/s
A student pulls horizontally on a block with a spring scale. The block reads 24.5 Newtons before the block starts to move. It reads 23.7 Newtons as she pulls the block at a constant velocity. How should she explain this?
Answer:
The coefficient of friction causes the force on the object to be less than its initial reading on the spring scale.
Explanation:
Since the block reads 24.5 N before the block starts to move, this is its weight. Now, when the block starts to move at a constant velocity, it experiences a frictional force which is equal to the force with which the student pulls.
Now, since the velocity is constant so, there is no acceleration and thus, the net force is zero.
Let F = force applied and f = frictional force = μN = μW where μ = coefficient of friction and N = normal force. The normal force also equals the weight of the object W.
Now, since F - f = ma and a = 0 where a = acceleration and m = mass of block,
F - f = m(0) = 0
F - f = 0
F = f
Since the force applied equals the frictional force, we have that
F = μW and F = 23.7 N and W = 24.5 N
So, 23.7 N = μ(24.5 N)
μ = 23.7 N/24.5 N
μ = 0.97
Since μ = 0.97 < 1, the coefficient of friction causes the force on the object to be less than its initial reading on the spring scale.
Which of these is not a method of preventing the corrosion of metals?
A) galvanising
B) painting
C) plating
D) rusting
Answer:
D
Explanation:
rusting is actually the corrosion of metals so it can't be a way to prevent itself.
What force would need to be added downwards to have this 2kg object accelerate at
5 m/s/s downward and 1.5 m/s/s to the left?
Answer:
Explanation:
A horizontal bar 1.5 metres long and of small cross-section rotates about vertical axis through one end. It accelerates uniformly from 1200 r.P.M. To 1500 r.P.M. In an interval of 5 seconds. What is the linear velocity at the beginning and end of the interval ? What are the normal and tangential components of the acceleration of the mid-point of the bar after 5 seconds after the acceleration begins ?
Answer:
a. i. 188.49 m/s. ii. 235.62 m/s. b. i. 117.81 m/s² ii. 4.71 m/s²
Explanation:
a. Since the linear velocity v = rω where r = radius of path = length of horizontal bar = 1.5 m and the initial angular speed ω₀ = 1200 r.P.M = 1200 × 2π/60 = 125.66 rad/s and final angular speed after the 5 seconds ω₁ = 1500 r.P.M = 1500 × 2π/60 = 157.08 rad/s
i. So, the initial linear velocity v₀ = rω₀ = 1.5 m × 125.66 rad/s = 188.49 m/s.
ii. The final linear velocity v₁ = rω₁ = 1.5 m × 157.08 rad/s = 235.62 m/s.
b. The mid-point of the bar is at a distance of one-half from the end of the bar. So its radius r' = r/2 = 1.5 m/2 = 0.75 m
i. Its normal acceleration a after the 5 seconds is a = r'ω₁² = 0.75 m × 157.08 rad/s = 117.81 m/s²
ii. Its tangential acceleration is given by a' = r'α where α = tangential acceleration
α = (ω₁ - ω₀)/t where t = 5 seconds
α = (157.08 rad/s - 125.66 rad/s)/5 s
= 31.42 rad/s ÷ 5 s
= 6.28 rad/s²
a' = r'α
= 0.75 m × 6.28 rad/s²
= 4.71 m/s²
Calculate the force used if 108J of work done is moving a wrapped present 9M
Answer:
F = 12 N
Explanation:
Mechanical Work
Mechanical work is the amount of energy transferred by a force. It's a scalar quantity, with SI units of joules.
Being F the force vector and s the displacement vector, the work is calculated as:
W = F.s
If both the force and displacement are parallel, then we can use the equivalent scalar formula:
W=F.s
When the value of the work is known and we need to find the force, we solve the above equation for F:
[tex]\displaystyle F=\frac{W}{s}[/tex]
The wrapping present is moved by s=9 m doing W=108 J of work. The force used is:
[tex]\displaystyle F=\frac{108}{9}[/tex]
F = 12 N
Which one is an example of a force pushing downward toward the ground.
Group of answer choices
A man pulled weeds in his garden
A woman moved her child from one place to another in a wagon
A bird sat on a telephone wire
A dog tugged on a rope held by a child
Answer: A woman moved her child from one place to another in a wagon
or A bird sat on a telephone wire
Explanation:
When a 0.292 kg mass on a string is swung at 8.45 m/s, it feels a centripetal acceleration of 78.9 m/s^2. What is the radius of the swing? (Unit = m)
Answer:
0.905
Explanation:
right answer
The radius of the swing is 0.905 m
Circular motionFrom the question, we are to determine the radius of the swing
Using the centripetal acceleration formula
[tex]a_{c}= \frac{v^{2} }{r}[/tex]
Where [tex]a_{c}[/tex] is the centripetal acceleration
v is the velocity
and r is the radius
From the given information,
v = 8.45 m/s
[tex]a_{c} = 78.9 \ m/s^{2}[/tex]
Then,
[tex]78.9 = \frac{8.45^{2} }{r}[/tex]
[tex]r = \frac{8.45^{2} }{78.9}[/tex]
[tex]r = \frac{71.4025}{78.9}[/tex]
r = 0.905 m
Hence, the radius of the swing is 0.905 m
Learn more on Circular motion here: https://brainly.com/question/25528860
You will measure and record the time it takes the cart to travel certain distances, and then complete some calculations. In the space below, write a scientific question that you will answer by doing this experiment.
Answer:
Take the measurement of the distance (d) with a meter rule (in meters) and also measure the time (t) of the travel in seconds with a stopwatch.
question: What is the speed of the cart?
Explanation:
The speed of an object in motion is the distance covered by the object with respect to time, that is, the ratio of distance covered to the time taken to reach that distance.
Speed = distance / time
= d (in meters m) / t (in seconds s) = m/s
How much work is done in lifting a 300 Newton rock 10 meters off the ground?
Answer:
3000 JExplanation:
The work done by an object can be found by using the formula
workdone = force × distance
From the question we have
workdone = 300 × 10
We have the final answer as
3000 JHope this helps you
2. How are electromagnets different from other magnets?
What does the REVOLUTION of Earth around the Sun bring us and how long does it take?
Answer:
takes 365 days and it bring us seasons such as, spring,winter and fall.
For every action, there is an equal and opposite reaction” is a definition of _________
Answer:
These two forces are called action and reaction forces and are the subject of Newton's third law of motion. Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects.
Answer: action, opposite
Explanation:
why we can not measure the total amount of heat energy that a body contains
Answer:
... As has been previously discussed, heat is not something that is contained in an object.
Explanation:
21. A teacher does the following:
i. walks 4 m, south
ii. walks 8 m, east
iii. walks 4 m, north
iv. walks 8 m, west.
The overall displacement of the teacher is
a. Om
b. 6 m
c. 12 m
d. ... Nonsense! It cannot be calculated without knowing time information.
Answer:
displacement is the change from a starting point. she ends up back where she started so her displacement is zero meters although she traveled 24m in all.
Convert 60000cm to m
Answer:
The answer is 600 using metric system
Answer:
600 cm
Explanation:
60,000 ÷100=600
What is the difference between the geographic North Pole and the magnetic north pole?
Answer:
Magnetic north is the direction towards the north magnetic pole, which is a wandering point where the Earth's magnetic field goes vertically down into the planet
Explanation:
I searched it up lol