HELLO CAN SOMEONE HELP ME PLS

A car is moving at 35 mph and comes to a stop in 5 seconds.

Find the acceleration of the car.

Answer:

v = 16.16 km/h

Explanation:

Distance covered by Wood Thrush is 1422 km across the Gulf of Mexico to Louisiana + 1343 km to reach  Virginia, where it spends the summer.

d = 1422 km + 1343 km

d = 2765 km

The trip takes approximately 171 hours, flying mostly at night, t = 171 hours

We need to find the average speed of the Wood Thrush. It can be given by :

[tex]v=\dfrac{d}{t}\\\\v=\dfrac{2765\ km}{171\ h}\\\\v=16.16\ km/h[/tex]

So, the average speed of the Wood Thrush is 16.16 km/h.

Answer:

Felipe's average speed over the 20s period is 14.4 km/h.

Explanation:

To determine the speed at which Felipe has walked, the distance traveled and the time it took him must be considered.

Thus, Felipe walked 80 meters (20 towards the truck, and 60 inside it) in a total of 20 seconds. That is, he traveled 4 meters per second (80/20 = 4).

Now, to transfer said speed to kilometers per hour, the following calculation must be performed:

1 hour = 60 minutes

1 = 60 seconds

Number of seconds in an hour: 60 x 60 = 3600

Thus, Felipe has walked at an average speed of 14,400 meters per hour (4 x 3,600 = 14,400). So, since a kilometer consists of 1000 meters, its average speed in kilometers per hour was 14.4 km / h (14,440 / 1,000 = 14.4).

Answer: the answer is 4.0 for both

Explanation: on khan academy !!!

Answer:

[See Below]

Explanation:

✦ Formula = [tex]Mass / 1000[/tex]

  ✧ [tex]4800 / 1000 = 4.8[/tex]

So [tex]4800[/tex] grams is equal to [tex]4.8[/tex] kilograms.

~Hope this helps Mate. If you need anything feel free to message me.

That's a good, simple description of a "hypothesis".

Another way to describe it is "an educated guess".

Once you have it in words, it's time to start checking it out, with experiments that can show whether it's true or not.  

If your experiments seem to show that your hypothesis seems to be true, that doesn't 'prove' it, but you can start calling your hypothesis a "theory".  

(It's possible that you may never be able to 'prove' it.  It may remain a theory forever. Like gravity, germs, atoms, and relativity.  Thousands of successful experiments don't 'prove' a theory, but it can be trashed by one good, valid experiment to show that it's false.)

Answer:

Zero

Explanation:

If using an ideal parallel plate capacitor, the electric field outside should be nearly zero.

Answer:

A.

Ok, suppose an experiment where you have a lot of dependent variables.

something like the variables y, z and k that change when you change the variable x.

Now, as you play with the variable x, you will notice changes in the variables z, y and k.

But there is now a question (a lot actually)

if the change in k was actually caused by the change in z?

Then you need to try to find a way of changing the value of z for a fixed value of x (designing an experiment) and see how k reacts.

This may be really hard, so as few responding variables you have, the simpler is the experiment, and easier will be to collect good data.

Now we also could discard the other options:

B: If the procedure is complex, then there are more ways in which the scientist can make a mistake that will introduce error to the data, so this will not improve the quality.

C: A larger sample will allow you to have more precision, as more subjects are being observed.

D: When we manipulate one variable, we may be actually introducing some quantity of error to the data.

For example, if the quantity is the voltage for an experiment, we actually do not know the exact voltage tath comes from the source, so there is a small source of error. Now as we start adding more and more independent variables, we also are adding more of these sources of errors, so an experiment with several independent variables will not improve the quality of the results.

Answer:

7500j

Explanation:

Work :

W = Fd (work = force x distance)

Force :

F = W/d

Distance :

d = W/F

Explanation:

7.9x10^9 km is equal to

=7900000000km

Please mark it as brainliast

Answer:

The spring constant is 222.2 N/m

Explanation:

Given;

mass of the spring, m = 200 g = 0.2 kg

extension of the spring, x = 15 cm = 0.15 m

speed of the mass, v = 5 m/s

spring constant, k = ?

Apply law of conservation of energy;

¹/₂kx² = ¹/₂mv²

k = mv² / x²

k = (0.2 x 5²) / (0.15²)

k = 222.2 N/m

Therefore, the spring constant is 222.2 N/m

Answer:

The definition of acceleration is is a vector quantity that is defined as the rate at which an object changes its velocity.

Explanation:

Answer:

DescriptionIn mechanics, acceleration is the rate of change of the velocity of an object with respect to time. Accelerations are vector quantities. The orientation of an object's acceleration is given by the orientation of the net force acting on that object.

Explanation:

Answer:

2144.7

Explanation:

Answer: hey!

i believe your answer is 6.09 times 10^-4

Explanation:

the exponent is negative 4 have a good day

Answer:

C) increases from left to right across the periodic table

Explanation:

if you're reading this, you better smile cause you aren't the only one stressed out about school :))) have a great day love

The trend of the reactivity of non metals in the periodic table is that it increases from left to right across the periodic table.

The periodic table is composed of metals on the left hand side and nonmetals on the right hand side.

As such, nonmetallic property increases from left to right across a period and so does the reactivity of nonmetals.

This implies that as we move from left to right across a period, nonmetallic elements become more reactive.

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Answer:

the stress in the cable at the time when the truck is stop is 2,344.57  lb/m^2

Explanation:

The computation of the stress in the cable when the truck comes to a stop is shown below:

We used the following formula

[tex]T = mg\times sin\theta\\\\= 4,000 \times sin15^{\circ}[/tex]

= 1,035.28

Now the stress in the cable is

Before calculating it first determined the area which is

[tex]Area = \frac{\pi}{4}\times (\frac{3}{4})^2 \\\\= \frac{9\pi}{64}[/tex]

So, the stress is

[tex]= \frac{T}{area}\\\\ = \frac{1,035.28}{\frac{9\pi}{64} }[/tex]

= 2,344.57  lb/m^2

Hence, the stress in the cable at the time when the truck is stop is 2,344.57  lb/m^2

Answer:

The value  is   [tex]  C_u   =   5 *10^{-6} F[/tex]

Explanation:

From the question we are told that

   The voltage of the capacitor is  [tex]V  =  90 \  V[/tex]

   The  capacitance of the capacitor is  [tex]C  =  30 \ \mu F =  30 *10^{-6} \  F[/tex]

   The  final voltage is  [tex]V_a =  20 \  V[/tex]

Since the capacitors are connected in parallel we have that

      [tex]Q_u  =  Q'_u  +  Q[/tex]

Where  [tex]Q_u[/tex] is the charge of the known capacitor before it is connected to the known capacitor

     [tex]Q_u' [/tex] is the charge of the known capacitor after it is connected

       [tex]Q  [/tex] is the charge of the unknown capacitor

Also the potential across the two capacitors will be the same (except for a loss due heat (it been converted to heat ))

So

            [tex]CV  =  CV_a +  C_u *  V_a[/tex]

=>          [tex]  C_u *  V_a   =  CV - CV_a [/tex]

=>          [tex]  C_u   =   \frac{CV - CV_a }{ V_a } [/tex]

=>          [tex]  C_u   =   \frac{ [30*10^{-6} *90] - [30*10^{-6} * 20] }{ 20 } [/tex]

=>        [tex]  C_u   =   5 *10^{-6} F[/tex]

Answer:

Explanation:

a

The angle each thread is making with the vertex = 16.5 degree

weight acting downwards = 66.7 x 10⁻³ x 9.8 N .

distance between two charges = 2 x 84.8 x 10⁻² sin 33/2

= .48 m

repulsive force between the two charges

= 9 x 10⁹ x q² / .48²

F = 39 x 10⁹ q²

Now, the tension in the thread be T

T cos 16.5 = mg

T sin 16.5 = F

dividing

tan 16.5 = F / mg = 39 x 10⁹ x q² / 66.7 x 10⁻³ x 9.8

.296 x  66.7 x 10⁻³ x 9.8 = 39 x 10⁹ x q²

q² = 4.96 x 10⁻¹²

q = 2.23 x 10⁻⁶ C

= 2.23 μC

Answer:

Explanation:

A and B are touched .

charge on each of them after touching = (9q - q) / 2 = 4q

when C is touched with A

charge on A and C each after touching

= 4q + 0 / 2 = 2q

When C is touched with B

charge on each of them

(2q + 4q ) / 2 = 3 q

Final charge on C = 3q

Answer:

✔ A and D

✔ B

✔ C

Explanation: because i said so

The density of the substance is its mass divided by volume. Thus, the volume of 1500 g soda with a density of 2.9 g/ml is 517.2 g/ml.

Density of a substance is the measure of its mass per unit volume. The density of a substance depends on its bond type, temperature and pressure as well.

The volume of a substance is the space occupied by its particles. The volume of the substance is the mass divided by density.

Volume is generally expressed in units of liters or milliliters.

Given that, mass of soda = 1500 g

density = 2.9 g/ml

volume = mass/ density

v  =  1500 g/ 2.9  g/ml = 517.2 ml.

Therefore, the volume of soda is 517.2 ml.

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Answer:

Explanation:

From, the given information: we are not given any value for the mass, the proportionality constant and the distance

Assuming that:

the mass = 5 kg and the proportionality constant = 50 kg

the distance of the mass above the ground x(t) = 1000 m

Let's recall that:

[tex]v(t) = \dfrac{mg}{b}+ (v_o - \dfrac{mg}{b})^e^{-bt/m}[/tex]

Similarly, The equation of mption:

[tex]x(t) = \dfrac{mg}{b}t+\dfrac{m}{b} (v_o - \dfrac{mg}{b}) (1-e^{-bt/m})[/tex]

replacing our assumed values:

where [tex]v_=0 \ and \ g= 9.81[/tex]

[tex]x(t) = \dfrac{5 \times 9.81}{50}t+\dfrac{5}{50} (0 - \dfrac{(5)(9.81)}{50}) (1-e^{-(50)t/5})[/tex]

[tex]x(t) = 0.981t+0.1 (0 - 0.981) (1-e^{-(10)t}) \ m[/tex]

[tex]\mathbf{x(t) = 0.981t-0.981(1-e^{-(10)t}) \ m}[/tex]

So, when the object hits the ground when x(t) = 1000

Then from above derived equation:

[tex]\mathbf{x(t) = 0.981t-0.981(1-e^{-(10)t}) \ m}[/tex]

[tex]1000= 0.981t-0.981(1-e^{-(10)t}) \ m[/tex]

By diregarding [tex]e^{-(10)t} \ m[/tex]

[tex]1000= 0.981t-0.981[/tex]

1000 + 0.981 = 0.981 t

1000.981 = 0.981 t

t = 1000.981/0.981

t = 1020.36 sec

Answer:

d) 4

Explanation:

The image attached shows the options.

The resultant vector is the resultant of two or more vectors. The resultant vector is gotten by adding the sum of the displacement of the vectors together (that is the sum of all the individual vectors).

From the question, since runner A runs north and runner B runs east the resultant vector would be the sum of the displacement of vectors A and B. Also, the direction of the vector would be the north east starting from the beginning of vector A to end of vector B. The correct option is d) 4

Answer:

17.115m/s

Explanation:

The formula that will be used to calculate the speed of the truck is expressed as shown:

v = √ar

a is the acceleration of the truck

r is the radius of curvature of the road at the top of the road plus centre of mass G who can be considered a particle, is 2 m

v = √a(R+G)

Given parameters

a = 0.3g (g is the acceleration due to gravity)

R = 98m

G = 2m

Substituting the values into the formula:

v = √0.3(9.81){98+2}

v = √0.3×9.81×100

v = √294.3

v = 17.155m/s

Hence the speed of the truck is 17.155m/s

Answer:

Product

Explanation:

Impulse is defined as the average force acting on an object times the time the force acts:

Impulse = F · Δt

Answer:

Specific gravity is 0.56

Explanation:

We know that

mass of water displaced by the wood is, m1( apparent mass when wood in air and lead is submerged in water) - m2(the apparent mass when wood and lead both are submerged in water)

= 0.0765 - 0.0452 = 0.0313 Kg

So the specific gravity of the wood is, = mass of wood / mass of water displaced by the wood

= 0.0175/0.0313

=0.56