The screwdriver used by an electrician has a plastic or rubber covers on them why

Answer:

velocity

Explanation:

Velocity represents the direction of an object with a specified speed

Answer:

4m/s

Explanation:

The motion is in downward direction, and the boat is moving with constant velocity, the position of the boat horizontally is 12m before the key fall.

The height difference "h"= ( y- y°)= 45 m

We can determine the needed time the key requires to reach the water using the expression from Newton's law

h= v(o) + 1/2 at^2

g= acceleration due to gravity= 9.8m/s^2

h= v(o) + 1/2 gt^2 -------------------------eqn*)

V(o)= 0 for the key= initial velocity

h= height that the key falls= 45m

If we substitute the above values into eqn(*) we have

We can make t^2 subject of the formula since v(0)= 0

t^2= h/(1/2 g)

= 45/(1/2× 9.8)

t^2= 45/4.9=9.18

t= √9.18

t=3.03 secs

Since the boat was moving with constant velocity,

Then Velocity= distance/ time

= 12/3.03

Velocity= 4m/s

Hence, the speed of the boat is 4m/s

Answer:

The person above me is correct. The speed of the boat is 3.6363m/s, or also 4m/s.

We know these following values from the key:

d = 45 , g = -9.8 (its because its falling) , vi = 0

With this, we can plug and chug using kinematic equations.

Doing so will get you 29.69 for Vf and 3.03 for time.

Now, we want the speed from the boat -- speed is defined as the distance over time. We know the distance from the boat is 12m, but now we know the time, which is 3.03.

-This time is correct because we know the boat was at "0m" when the key was at the start, but after it dropped, it was at 12m. So by finding out the time it took for the key to drop, it also tells us the amount of time it took the boat to travel 12m.

So this means we can divide 12m by 3.03s, or you can round it to 3. Whatever really works;

12/3.03 should get you something like 3.63 repeating

if you rounded, you will get 12/3, which is 4.

Answer:

gas vibrate, move about freely at high speeds, liquid vibrate, move about, and slide past each other. solid vibrate (jiggle) but generally do not move from place to place

Answer:

is the first confirmed terrestial planet to have been discovered outside the solar system by the kepler space telescope

Explanation:

Answer:

tumko hy matlab hai mera

Answer:

See the answers below

Explanation:

To solve this problem we must use the following equation of kinematics.

[tex]v_{f}=v_{o}+a*t[/tex]

But first we must convert the velocity from kilometers per hour to meters per second.

[tex]72[\frac{km}{h}]*[\frac{1000m}{1km}]*\frac{1h}{3600s} =20[m/s][/tex]

i)

Vf = final velocity = 20 [m/s]

Vo = initial velocity = 0 (stars from the rest)

a = acceleration [m/s²]

t = time = 4 [s]

[tex]20 = 0+a*4\\a=20/4\\a = 5[m/s^{2}][/tex]

ii)

Now we can calculate the distance with the following equation of the kinematics.

[tex]v_{f}^{2}=v_{o}^{2} +2*a*x[/tex]

where:

x = distance covered [m]

[tex]20^{2} =0 +2*5*x\\400=10*x\\x = 40 [m][/tex]

Answer:

Corvette Corvette

Explanation:

teehee

The answer is A btw :)

When two particle have the same displacement from the equilibrium position and the same velocity, they are said to be in phase with one another.

Phase is the location of a time point on a waveform's cycle. A phase is an dimensionless quantity. While two or more waveforms may have the same frequency, cycle, and wavelength, phase refers to how closely they are aligned.

Particles in a medium said to be in phase with one another  when they have the same displacement from the equilibrium position and the same velocity. As frequency and wavelength is property of waves - not  particles.

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Answer:

because the density of iron nail is more tha n density of water but the density of ship made iron steel is less than the density of water

Solution :

Given weight of Kathy = 82 kg

Her speed before striking the water, [tex]$V_o $[/tex] = 5.50 m/s

Her speed after entering the water, [tex]$V_f$[/tex]= 1.1 m/s

Time = 1.65 s

Using equation of impulse,

[tex]$dP = F \times dT$[/tex]

Here, F =  the force ,

       dT =  time interval over which the force is applied for

            = 1.65 s

       dP  = change in momentum

dP = m x dV

    [tex]$= m \times [V_f - V_o] $[/tex]

    = 82 x (1.1 - 5.5)

    = -360 kg

∴ the net force acting will be

[tex]$F=\frac{dP}{dT}$[/tex]

[tex]$F=\frac{-360}{1.65}$[/tex]

  = 218 N

Answer:

Explanation:

Answer:

1. Ability of problem solving.

2. Physics gives u a job.

3. Physicists can become engineers.

4. Physics puts your math to use.

5. Physics is versatile.

6. Physics makes things possible.

Answer:

Power Skids

Explanation:

Power Skid like the question suggested, is a skid that occurs when you suddenly press too hard on the accelerator and the drive wheels lose traction. Power Skid is one of the 4 types of Skids. The other 3 includes;

Cornering skid

Blowout skid and

Braking skid.

Power skid occurs mostly as a result of insanely high speed and or acceleration,when the accelerator is pressed on too suddenly causing the vehicle to be driven beyond its capabilities, and then to skid, ultimately.

The net force on a body is the resultant of all the force acting on the body, which can be calculated by the vector addition of all the forces as the force is a vector quantity.

Generally, the components of the forces in a single direction (x,y, and z) added together, then the resultant of all the forces can be determined which is the net force.

For example if f1, f2,..fn are n forec action on the body as

f1 = a1 i + b1 j + c1 k

f2= a2 i + b2 j + c2 k

fn = an i + bn j +cn k

Then the net force, F, action on the body

F= f1 + f2+ ... +fn

F= (a1 i + b1 j + c1 k) + (a2 i + b2 j + c2 k)+...+(an i + bn j +cn k)

F=(a1+a2+...an)i+(b1+b2+...+bn)j + (c1+c2+...+cn)k which is the net force.

In this way, the net force can be determined.

Answer:

solution

Explanation:

Answer:

When a substance dissolves in water, you can’t see it anymore, it’s still there, but has mixed with the water to make a transparent liquid called a solution. The bonds in salt compounds are called ionic because they both have an electrical charge—the chloride ion is negatively charged and the sodium ion is positively charged.

Explanation:

Answer:

12.25 meters

Explanation:

s=1/2(v+u)t

s= displacement

v= final velocity

u= initial velocity

t= time

7m/s+0m/s divide by 2= 3.5 m/s velocity  Times 3.5 seconds=  12.25 meters

Answer:

Wave X has a shorter wavelength.

Explanation:

The relation between the speed of a wave, its wavelength and frequency is given by :

[tex]v=f\lambda[/tex]

It can be seen that the relationship between the frequency and wavelength is inverse.

In this problem, it is mentioned that two sound waves (wave X and wave Y) are moving through a medium at the same speed. The frequency of wave X is greater than wave Y. Then it would mean that wave X have shorter wavelength than wave Y (due to inverse relation).

Answer:

c) those caused by parasites

Answer:

312

Explanation:

Answer:

waste

Explanation:

took da test. nhgvgg

Answer:

D. 72.9 cm/s towards the wall

Answer:

The second person will have a velocity of 0.85 m/s in the opposite direction of the first person.

Explanation:

Law Of Conservation Of Linear Momentum

The total momentum of a system of bodies is conserved unless an external force is applied. The formula for the momentum of a body with mass m and velocity v is:

P=mv.

If we have a system of bodies, then the total momentum is the sum of them all

[tex]P=m_1v_1+m_2v_2+...+m_nv_n[/tex]

If a collision occurs, the velocities change to v' and the final momentum is:

[tex]P'=m_1v'_1+m_2v'_2+...+m_nv'_n[/tex]

In a system of two masses, the law of conservation of linear momentum is:

[tex]m_1v_1+m_2v_2=m_1v'_1+m_2v'_2[/tex]

According to the conditions of the problem, two persons standing on a frictionless surface are initially at rest (v1=0, v2=0). Their masses are m1=50 Kg and m2=65 Kg. After the push, one person (say m1) moves backward at v1'=-1.1 m/s. We can calculate the speed of the other person by solving for v2':

[tex]\displaystyle v'_2=\frac{m_1v_1+m_2v_2-m_1v'_1}{m_2)[/tex]

Substituting:

[tex]\displaystyle v'_2=\frac{50*0+65*0-50(-1.1)}{65)[/tex]

[tex]\displaystyle v'_2=\frac{55}{65}[/tex]

[tex]v'_2=0.85 \ m/s[/tex]

The second person will have a velocity of 0.85 m/s in the opposite direction of the first person.

The distance of the trip that Kayak travelled at an average speed of 18 mph in 5 hour is 90 miles

First, we shall obtain the eqaution to determine the distance. This can be obtained as follow:

Speed is defined as:

Speed = distance / time

Cross multiply

Distance = speed × time

With the above formula, we can obtain the distance. Details below

The following data were obtained from the question:

Distance = speed × time

Distance = 18 × 5

Distance = 90 miles

From the above calculation, we conclude that the distance traveled is 90 miles

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Answer:

Explanation:

Step one:

given data

the current in each 10.0 Ω

The power supply is 60.0 V.

Required:

current in the series and parallel circuit arrangement

Step two:

The drawing looks like a ladder with 4 rungs.

One rung is a 60-volt battery.

The other 3 rungs are the 3 resistors.

a).  The equivalent resistance is the reciprocal of (1/10 + 1/10 + 1/10).

That's the reciprocal of  3/10, or about 0.3ohms.  

b).  I = V/R = 60 /0.3...  =  200 Amperes.

Answer:

for series: i=v/r

V=60volts

R=30ohms (added ohms of the 3 resistors)

i=60volts/30ohms

i=2amps

for parallel: i=v/r1 + v/r2 ...

v=60volts

r1=10

r2=10

r3=10

i=60/10+60/10+60/10

i=6+6+6

i=187

Explanation:

https://phys.libretexts.org/Bookshelves/University_Physics/Book%3A_University_Physics_(OpenStax)/Book%3A_University_Physics_II_-_Thermodynamics_Electricity_and_Magnetism_(OpenStax)/10%3A_Direct-Current_Circuits/10.03%3A_Resistors_in_Series_and_Parallel

Answer:

See the answers below.

Explanation:

In order to solve this problem we must use the principle of conservation of momentum and the amount of movement. Where the car moves to the left with a negative speed sign while the force of the collision will be taken to the right.

[tex]-m_{car}*v_{car1}+(F*t)=m_{car}*v_{car2}[/tex]

where:

Vcar1 = velocity of the car before the collision = - 15 [m/s]

F = impact force [N]

Vcar2 = velocity of the car after the collision = 2.6 [m/s]

[tex]-(1500*15)+(F*t)=(2.6*1500)\\F*t=22500+3900\\F*t=26400[kg*m/s][/tex]

Where the product of force by Time is equal to the impulse caused by the collision.

[tex]And the force\\F = P/t\\F=26400/0.15\\F=176000[N][/tex]

Answer:

Cold air from the house is moved through pipes, where it absorbs thermal energy.

Explanation:

Answer:

Like your refrigerator, heat pumps use electricity to move heat from a cool space to a warm space, making the cool space cooler and the warm space warmer. ... The most common type of heat pump is the air-source heat pump, which transfers heat between your house and the outside air.

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Answer:

1,470,000Joules

Explanation:

Work done = Force * distance moves in the direction of the force

Given

mass = 3000kg

distance = 20m

Get the force

F = mg

F = 3000(9.8)

F = 29400N

Get the work done

Work done = 29400 * 50

Work done = 1,470,000Joules

Hence 1,470,000Joules work has been done on the concrete

Answer:

Please find the answer in the explanation.

Explanation:

Given that two porters are available to carry a long timber wood.out of them one is weak. how do you make less load to the weak one?

We can make the weak one to carry less load through two different ways or means.

First, if we can locate the centre of gravity and centre of mass of the long timbre wood, the week one can carry the other end away from the center of gravity and centre of mass.

Second, the strong porter can carry the long timbre wood almost to the fulcrum and allow the weak one to support at the other end. By doing this, the weak one will only carry light portion of the load.

Answer:

the mechanical advantage is 10

Explanation:

The computation of the mechanical advantage is as follows:

Mechanical advantage is

= Load ÷ Effort

where,

The Loan is equivalent to the weight i.e. 500 lb

And, the effort is equivalent to the force applied  i.e. 50lb

So, the mechanical advantage is

= 500 ÷ 50

= 10

Hence, the mechanical advantage is 10

Answer:

[tex]\huge\boxed{\sf v = 0.75\ m / s}[/tex]

Explanation:

Given Data:

Wavelength = λ = 0.25 m

Frequency = f = 3 Hz

Required:

Speed = v = ?

Formula:

v = fλ

Solution:

v = (3)(0.25)

v = 0.75 m / sec

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

Answer:

insulator

Explanation:

it keeps heat in not moves it

Answer:

2 moles of H2Nsuperscript(-) or NHsubscript2 , amide group!

I hope it will be useful.