Answer:
[tex]F=\frac{mgh-\frac{1}{2} mv^2}{d}[/tex]
Explanation:
Step 1: Write out equation
[tex]\frac{1}{2} mv^2+Fd=mgh[/tex]
Step 2: Subtract FD on both sides
[tex]\frac{1}{2} mv^2=mgh-Fd[/tex]
Step 3: Subtract mgh on both sides
[tex]\frac{1}{2} mv^2-mgh=-Fd[/tex]
Step 4: Divide both sides by -d
[tex]\frac{\frac{1}{2} mv^2-mgh}{-d} =F[/tex]
Step 5: Rewrite
[tex]F=\frac{mgh-\frac{1}{2} mv^2}{d}[/tex]
Just need help with 1 and 2 please :D i’m having a bit of trouble :/
how should an ammeter and voltmeter be connected in a circuit and why?? I need ans acc to grade 10th
Answer:
An ammeter should be connected in the series while the voltmeter in parallel.
Explanation:
Ammeter is the device used to measure the electric current. So , the total current flowing through the circuit must pass through the ammeter. Thus , it should be connected in series. While voltmeter is a device used to measure the potential difference between two ends. Therefore, voltmeter should be connected in parallel to measure the potential difference across two ends.
Evaluate u + xy, for u = 1, x = 3, and y = 6.
12. The windings of a particular type of DC motor are in its rotor. The magnetic field is reversed during the rotation of the rotor by means of the
A. field magnets.
B. commutator.
C. applied power source reversal.
D. armature coil split windings.
Answer:
B. commutator
Explanation:
The DC motor has a commutator, to keep the rotor rotating. The rotor of the DC motor usually stop spinning once it aligns with the magnetic field. However, the commutator would reverse the current through the stator and in this process reverse the magnetic field. This ensures continuous spinning of the rotor.
Therefore, the correct option is "B. commutator."
the Velocity Ratio of a single movable Pulley is 2 why
How can Newton’s laws explain why the brain is in danger of injury when there is impact to the head?
Answer:
The brain moves inside the skull with a force equal and opposite to that of the impact.
Explanation:
What is moment? What are the two factors which affect moment
Explanation:
moment is an expression involving the product of a distance and physical quantities.
-the size of force applied.
-the perpendicular distance from the pivot to the line of action of the force
A ball is held at rest and then dropped. The final velocity of the ball was 45 m/s just before it hit the ground. How high was the ball when it was dropped?How much time past before the ball hit the ground?
Answer:
a) y = 103.21 m
b) t = 4.6 s
Explanation:
a) The height at which the balls was is given by:
[tex] V_{f}^{2} = V_{0}^{2} - 2g(y_{f} - y_{0}) [/tex]
Where:
[tex]y_{f}[/tex]: is the final height = 0
[tex]y_{0}[/tex]: is the initial height =?
[tex]V_{f}[/tex]: is the final velocity = 45 m/s
[tex]V_{0}[/tex]: is the initial velocity = 0 (is held at rest
g: is the gravity = 9.81 m/s²
Hence, the height is:
[tex] y_{0} = \frac{V_{f}^{2}}{2g} = \frac{(45 m/s)^{2}}{2*9.81 m/s^{2}} = 103.21 m [/tex]
b) The time before the ball hit the ground is:
[tex] V_{f} = V_{0} - g*t [/tex]
[tex] t = -\frac{V_{f}}{g} = -\frac{- 45 m/s}{9.81 m/s^{2}} = 4.6 s [/tex]
Therefore, 4.6 seconds passed before the ball hit the ground.
I hope it helps you!
which three metal do you think might be present in alnico explain ? ans which one are magnetic
Answer:
Aluminium, Nickel, Cobalt and Iron plus varying levels of Copper, Titanium and Niobium.
MAGNETIC: Alni, Alcomax, Hycomax, Columax, and Ticonal.
A truck of mass 500kg moving at 4m/s collides with another truck of mass 1500kg moving in the same direction at 2m/s. What is their common velocity just after the collision if they move off together? PLZ HELP ASAP
Answer:
m1u1+m2u2=(m1+m2)v.
500×4+1500×2=(500+1500)V.
2000+3000=2000V.
5000=2000V.
V=2.5m/s
You serve a volleyball with a mass of 2 kg. The ball leaves your hand with a speed of 30 m/s. What is the KE of the ball? find the product
Answer:
KE= 900joules, product= 60kgm/s momentum
Explanation:
KE=1/2MV2= 1/2× 2×30×30=900J
PRODUCT= MOMENTUM= 30m/s×2kg= 60kgm/s
870 kilograms to pounds
Answer:
870kg = 1,917.48 lbs
Explanation:
1 kilogram = 2.204 pounds
pounds = 870(2.204)
pounds = 1,917.48
I hope this helps!
-TheBusinessMan
Answer:
1918.35
Explanation:
multiply the value to mass... which is 2.205
so 870×2.205=1918.35
If a honeybee is flying 7.0 m/s, what is the kinetic energy (Joules) if its mass is 0.1 g?
Answer:
KINETIC ENERGY=K.E=0.00245 Joules ≈ 0.003 Joules
Explanation:
mass=m=0.1g=0.0001kg
velocity=v=7.0m/s
kinetic energy=K.E.=?
as we know that
[tex]kinetic energy=\frac{1}{2}mv^2\\ putting values\\kinetic energy=\frac{1}{2}(0.0001kg)(7.0m/s)^2\\ kinetic energy=\frac{1}{2} 0.0049joules\\kinetic energy= 0.00245Newton meter or joules[/tex]
hope it will help ^_^
why is skipping quicker than running
Answer:
because you are taking longer and faster strides
Explanation:
Answer:
you are taking longer to skip.
Explanation:
the liquid pressure varies with depth why
Explanation:
Hey, there!
The liquid pressure varies with depth because liquid pressure is directly proportional to the depth of liquid from the free surface of the liquid. so, more the depth more the pressure and less the depth less the pressure.
Hope it helps...
Now the proton at B is removed and replaced by a lithium nucleus, containing three protons and four neutrons. The proton at location A remains in place. What is the magnitude of the electric force on the lithium nucleus
The magnitude of the electric force on the electron is 480 x 10⁻¹⁹ N .
How to calculate the magnitude?|F-->1| = E-->1 x charge on proton
= 300 x 1.6 x 10⁻¹⁹
Magnitude of the electric force on proton
|F-->1| = 480 x 10⁻¹⁹ N .
Inside the lithium nucleus , there are three protons so charge on it
= 3 x 1.6 x 10⁻¹⁹
= 4.8 x 10⁻¹⁹ C .
The magnitude of electric force on lithium nucleus
|F-->Li| = E-->1 x charge on lithium nucleus
= 300 x 4.8 x 10⁻¹⁹
= 1440 x 10⁻¹⁹ N .
Electron has same charge as that possessed by proton so charge on electron = 1.6 x 10⁻¹⁹ C
Magnitude of force on electron
|F-->1| = E-->1 x charge on electron
= 300 x 1.6 x 10⁻¹⁹
= 480 x 10⁻¹⁹ N .
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Complete question
A proton at location A makes an electricfield E-->1 atlocation B. A different proton, placed atlocation B, experiences a force F--->1.
If |E-->|= 300 N/C, what is |F-->1|?
|F-->1|= N
Now the proton at B is removed and replaced by alithium nucleus, containing three protons and four neutrons. Theproton at location A remains in place.
What is the magnitude of the electric force on the lithium nucleus?
|F-->Li| = N
Now the Lithium nucleus is removed, and an electron is placed atlocation B. The proton atlocation A remains in place. What is the magnitude of the electric force on the electron?
7 A steel sphere is released from a height
of 9 m on the surface of the Moon. It is
known that the acceleration due to gravity
on the Moon is 1 the acceleration due
6
to gravity on the surface of the Earth.
Calculate the time taken by the sphere to
hit the surface of the Moon.
A 1.8 S
C 3.3 s
B 2.6 s
D 4.2 s
Answer:
C 3.3 s
Explanation:
Given:
Δy = 9 m
v₀ = 0 m/s
a = ⅙ (9.8 m/s²) = 1.63 m/s²
Find: t
Δy = v₀ t + ½ at²
9 m = (0 m/s) t + ½ (1.63 m/s²) t²
t = 3.3 s
How do we represent Earth’s face?
Answer:
Human-driven changes in arrive utilize and arrive cover such as deforestation, urbanization, and shifts in vegetation designs moreover change the climate, coming about in changes to the reflectivity of the Soil surface (albedo), emanations from burning timberlands, urban warm island impacts and changes within the normal water cycle.
Which is an example of potential energy? a swimmer kicking their legs a car driving on the road an arrow flying at a target a yo-yo in someone’s hand
Answer:
The yo-yo :)
Explanation:
The atmospheric pressure on a mountain is 550 mmHg and 1 atm is equal to 760 mmHg. What is the pressure in atm? Give your answer to 2 significant figures760 mmHg what is the pressure in atm?
Answer:
0.72 atm
Explanation:
Given that the atmospheric pressure on a mountain is 550 mmHg.
Where 1 atm is equal to 760 mmHg.
To Convert millimetre mercury (mmHg) into atmospheric pressure units (atm) , divide the magnitude of pressure by 760. That is,
Pressure = 550/760
Pressure = 0.724 atm
Therefore, pressure in atm is 0.72 atm in two significant figures
An apple is falling from a tree. Disregarding air resistance, which diagram shows the free-body diagram of the force
or forces acting on the apple?
Answer: Second choice (straight down arrow)
Explanation:
I just did it.
Disregarding air resistance, the diagram showing the free-body diagram of the force or forces acting on the apple is second one.
What is free falling?When an object is released from rest in free air considering no friction, the motion is depend only on the acceleration due to gravity, g.
Given is an apple is falling from a tree.
When apple is falling down, the gravity will attract the apple towards the center of the Earth. Air resistance is not considered, otherwise it would be acting upwards.
Normal force will not act as apple in not placed on any kind of surface.
So, the only force acting is force of gravity also called as weight of apple.
Thus, the free-body diagram of the force or forces acting on the apple is second one.
Learn more about free falling.
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QUESTION 5
A small beaker has 50 mL of water in it. A small frog with a mass of 20 grams is dropped into the beaker. The water level rises to 79
mL. What is the density of the frog? (You know the mass of the frog, first find the volume of the frog, then use the density formula to.
Answer:
0.69 g/cm^3
Explanation:
Given that a small beaker has 50 mL of water in it. A small frog with a mass of 20 grams is dropped into the beaker. The water level rises to 79mL.
The volume of the frog will be:
79 - 50 = 29mL
Convert it to litre by dividing it by 1000
29/1000 = 0.029 L
Since 1L = 1000 cm^3
Convert it to cm^3 by multiplying it by 1000
0.029 × 1000 = 29 cm^3
Density = mass/volume
Substitute the mass and volume into the formula
Density = 20/29
Density = 0.6896 g/cm3
Therefore, the density of the frog is 0.69 g/cm^3 approximately
An electric pump rated at 1000W, takes 16 seconds to pump 100 kg of water out to a tank at a height of 10 m. what is the efficiency of the motor?
Answer:
[tex] \boxed{\sf Efficiency \ of \ the \ motor = 62.5 \ \%} [/tex]
Given:
Input Power ([tex] \sf P_i [/tex])= 1000 W
Mass (m) = 100 kg
Height (h) = 10 m
Time (t) = 16 s
To Find:
Efficiency of the motor
Explanation:
[tex] \boxed{ \bold{Output \: power \: (P_o)= \frac{mgh}{t}}}[/tex]
[tex] \sf \implies P_o = \frac{100 \times 10 \times 10}{16} [/tex]
[tex] \sf \implies P_o = \frac{10000}{16} [/tex]
[tex] \sf \implies P_o = \frac{ \cancel{16} \times 625}{ \cancel{16}} [/tex]
[tex] \sf \implies P_o = 625 \: W[/tex]
[tex] \boxed{ \bold{Efficiency = \frac{Output \ Power \ (P_o)}{Input \ Power \ (P_i) } \times 100}}[/tex]
[tex]\sf \implies Efficiency = \frac{625}{10 \cancel{00}} \times \cancel{100}[/tex]
[tex]\sf \implies Efficiency = \frac{625}{10} [/tex]
[tex]\sf \implies Efficiency = 62.5 \: \%[/tex]
[tex] \therefore[/tex]
Efficiency of the motor = 62.5 %
a.
To improve feelings about a poor test result, a student should
Beg the teacher for a second chance at the c. Ask their parents for assistance in persuading
test
the teacher to change a grade
b. Ask for an opportunity to earn extra creditd. All of these
Please select the best answer from the choices provided
A
B
ОООО
С
D
Answer:
Well, their are two answers in their. It would be Ask their Parent for assistance in persuading and Ask for an opportunity to earn extra credit:)
Explanation:
To improve feelings about a poor test result, a student should ask for an opportunity to earn extra credits. Hence, option D is correct.
How to handle disappointment at result?Remember that you are so much more valuable than a letter on a piece of paper. Your attitude, personality, and experience are things that future employers, coworkers, teachers, friends, and family are interested in. Even while practicing excellent self-care is always important, having a program in place will help you deal with any anxiety you may be experiencing in the future.
Start with the fundamentals, like eating healthily, Getting your five a day is a fantastic place to start Since it provides your body and brain with all the nutrition they require, and it can help you deal with any cortisol increases (stress). Additionally, ensure you get at least eight hours of sleep each night and consume six to eight glasses of water each.
To improve feelings about a poor test result, a student should ask for an opportunity to earn extra credits. Hence, option D is correct.
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2500m =_____km
480cm=_______m
75mL=______L
65g=________mg
5.6kg=_______g
50cm=______m
6.3cm=________mm
Answer:
1. 2.5km
2. 4.8m
3. 0.075 litre
4. 65000mg
5. 5600g
6. 0.5m
7. 63mm
Explanation:
1. 1000m in 1 km so divide by 1000
2. 100cm in m so divide by 100
3. 1000ml in 1l so divide by 1000
4. multiply the mass value by 1000
5.multiply the mass value by 1000
6. divide the length value by 100
7. multiply the length value by 10
hope this helps
What is the volume of a cone with a height of 27 cm and a radius of 13 round your answer to the nearest tenth
Answer:
4.775,94
Explanation:
FORMULA:
[tex]\frac{1}{3} * 3,14 * Rx^{2} * H[/tex]
one-third per "pi" (3.14), per radius squared, per height.
Answer:
vol = 4778.36 cm³
Explanation:
volume of a cone = 1/3 π r² h
height (h) = 27 cm
radius (r) = 13 cm
plug in values:
vol = 1/3 π (13)² 27
vol = 4778.36 cm³
An elevator has the mass of 3 tons of power needed to raise the elevator 50m in 15 s?
Answer:
Mass=3,time=15,height=50,g=10,Power=?.
Power=mgh/t.....3×10×15=1500/15=100Watts.
Answer:
[tex]\huge \boxed{\mathrm{100 \ Watts}}[/tex]
Explanation:
[tex]\sf \displaystyle P=\frac{mgh }{t} \\\\\\ P=power \ (W) \\\\ m=mass \ (kg) \\\\ g=gravity \ acceleration \ (m/s^2) \\\\ h=height \ (m) \\\\ t=time \ taken \ (s)[/tex]
[tex]\sf \displaystyle P=\frac{3 \times 10 \times 50 }{15}[/tex]
[tex]\sf \displaystyle P=\frac{1500 }{15}[/tex]
[tex]\sf \displaystyle P=100[/tex]
Using the same cost and time estimates, consider the time-effectiveness of each engineer.
If SciTech is most concerned about meeting a deadline regardless of the cost, which engineer should the company choose?
Camilla
John
Nora
Oracio
Answer:
Camilla
Explanation:
Answer:Camilla
Explanation:
1. Black Panther ran 567.6 km to the east in 23 hours then turned around and ran 221.8 km to the west in 1.2 hours. What was his average velocity during the trip in km h?p
Answer:
80.08 km/h
Explanation:
Given that Black Panther ran 567.6 km to the east in 23 hours
Velocity = distance covered/time
Substitute the distance covered and time into the formula
Velocity = 567.6/23
Velocity = 24.68 km/h
then turned around and ran 221.8 km to the west in 1.2 hours.
Velocity = 221.8/1.2
Velocity = 184.83 km/h
What was his average velocity during the trip in km/h ?
Average velocity = (V + U)/2
Since the two velocity are opposite to each other, the average velocity will be:
Average velocity = (-24.68 + 184.83)/2
Average velocity = 160.15/2
Average velocity = 80.08 km/h
Therefore, his average velocity during the trip is 80.08 km/h
3. You are walking at a 1m/s velocity and carrying a tray with a ball at rest on the tray. You come to a brief stop and the ball rolls off the tray. What causes the ball to roll off the tray?
Help ????????????????
Answer:
Inertia.
Explanation:
You are moving with a speed of 1 m/s. You are carrying a tray and the ball is at rest in the tray. You stops and the ball rolls off the tray. Whenever you starts moving with a speed of 1 m/s and when ball is at rest, due to inertia of motion the ball comes in motion. But when you stops, the ball is still in motion due to its inertia.
Hence, due to inertia the ball roll off the tray.