If a cliff jumper leaps off the edge of a 100m cliff, how long does she fall before hitting the water? (assume zero air resistance)

Answer:

The speed is 1.35 m/s

Explanation:

(m1+m2) vi= m1+m2v2

(50+1.5) (3.5)=50 (5+v2) +1.5 v2

180.25= 250+ 51.5 v2

180.25- 250+ 51.5 v2

-69.75= 51.5 v2

v2= -1.35 m

Answer:

The moon has no atmosphere

Explanation:

The temperatures on the surface of the Moon vary much more than those on Earth because the moon has no atmosphere (third answer in the list), and therefore there are no molecules that could retain residual heat and make the change from day to night a softer transition.

Answer:

Yes please

Explanation:

Answer:A

Explanation: it’s a covalent bond plus i just took mines

Answer:

I can't see it because it's too blury. try to search it

Answer:b

Explanation:

took test, might be wrong

Answer:

C ) Extreme temperature differences in summer and winter

Explanation:

can i get the crown please hhehehh hahahhah lol

Answer:

a. The force of gravity on the droplet is approximately 4.606 × 10⁻¹⁴ Newtons

b. The electric force that balances the force of gravity is approximately -4.606 × 10⁻¹⁴ Newtons

c. The excess charge is approximately -1.439375 × 10⁻¹⁸ C

d. There are approximately 9 excess electrons on the droplet

Explanation:

The parameters of the Millikan experiment are;

The mass of the droplet, m = 4.7 × 10⁻¹⁵ kg

The electric field in which the droplet floats, E = 3.20 × 10⁴ N/C

a. The force of gravity on the droplet, F = The weight of the droplet, W = m × g

Where;

g = The acceleration due to gravity ≈ 9.8 m/s²

W = 4.7 × 10⁻¹⁵ kg × 9.8 m/s² = 4.606 × 10⁻¹⁴ Newtons

∴ The force of gravity on the droplet = W = 4.606 × 10⁻¹⁴ Newtons

b. The electric force that balances the force of gravity, [tex]F_v[/tex] = -W = -4.606 × 10⁻¹⁴ Newtons

c. The excess charge is given as follows;

[tex]F_v[/tex] = q·E

∴ The electric force that balances the force of gravity, [tex]F_v[/tex] = q·E =  -4.606 × 10⁻¹⁴ N

q·E =  -4.606 × 10⁻¹⁴ N

q =  -4.606 × 10⁻¹⁴ N/E

∴ q = -4.606 × 10⁻¹⁴ N/(3.20 × 10⁴ N/C) ≈ -1.439375 × 10⁻¹⁸ C

The excess charge, q ≈ -1.439375 × 10⁻¹⁸ C

d. The charge of one electron, e = 1.602176634 × 10⁻¹⁹C

The number of excess electrons in the droplet, n, is given as follows;

n = 1.439375 × 10⁻¹⁸ C/(1.602176634 × 10⁻¹⁹C) = 8.98387212405 electrons

∴ n ≈ 9 electrons.

a. The force of gravity on this droplet is [tex]4.606 \times 10^{-14} \;Newton[/tex]

b. The electric force that balances this droplet is [tex]-4.606 \times 10^{-14} \;Newton[/tex]

c. The excess charge is equal to [tex]-1.44 \times 10^{-18}\;C[/tex]

d. The number of excess electrons that are on this droplet is 9.0 electrons.

Given the following data:

Scientific data:

a. To calculate the force of gravity on this droplet:

The force of gravity on this droplet is equal to the weight of the droplet and it would be calculated by using this formula:

[tex]F = mg\\ \\ F = 4.7 \times 10^{-15} \times 9.8\\ \\ F = 4.606 \times 10^{-14} \;Newton[/tex]

b. To calculate the electric force that balances this droplet:

The electric force that balances this droplet is equal to the negative weight of the droplet.

[tex]F_e = -mg = -4.606 \times 10^{-14} \;Newton[/tex]

c. To calculate the excess charge:

Mathematically, the excess charge is given by this formula:

[tex]q=\frac{F_e}{E} \\ \\ q=\frac{-4.606 \times 10^{-14}}{3.2 \times 10^4} \\ \\ q=-1.44 \times 10^{-18}\;C[/tex]

d. To calculate the number of excess electrons that are on this droplet:

[tex]n=\frac{1.44 \times 10^{-18}}{1.6 \times 10^{-19}} [/tex]

n = 9.0 electrons

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Answer:

5.5 rad/sec

Explanation:

Answer:

5.47 rad/s

Explanation:

We can solve this problem using the principle of conservation of energy and angular momentum.

First, let's find the initial kinetic energy of the projectile:

K1 = (1/2) * m * v1^2

= (1/2) * 0.2 kg * (50 m/s)^2

= 250 J

where v1 is the initial velocity of the projectile.

Next, let's find the final kinetic energy of the projectile:

K2 = (1/2) * m * v2^2

= (1/2) * 0.2 kg * (-25 m/s)^2

= 67.5 J

where v2 is the final velocity of the projectile after the collision.

The loss of energy in the collision is:

ΔK = K1 - K2

= 187.5 J

This energy is transferred to the blades, causing them to spin. Let's assume that all of this energy is converted to rotational kinetic energy of the turbine.

The final rotational kinetic energy of the turbine is:

K_rot = (1/2) * I * ω^2

where I is the moment of inertia of the turbine and ω is the final rotational velocity of the turbine.

Using the conservation of energy, we can equate the loss of kinetic energy in the collision to the gain in rotational kinetic energy of the turbine:

ΔK = K_rot

187.5 J = (1/2) * 12.5 kg m^2 * ω^2

ω^2 = (2 * 187.5 J) / (12.5 kg m^2)

ω^2 = 30

ω = 5.47 rad/s

Therefore, the rotational velocity of the turbine after the collision is 5.47 rad/s.

Answer:

3

Explanation:

Trust me its the right answer

Answer:

C. sodium combines with chlorine to form sodium chloride

Explanation:

Answer:

C. sodium combines with chlorine to form sodium chloride.

Explanation:

Answer: Hand tools are necessary for daily activities.

Explanation:

The hand tools are useful for day to day activities they aid in pouring substances, holding things, mixing substances, cleaning and for other purposes. In a chemical laboratory the hand tools like test tube holders can help in holding the chemicals. In a medical laboratory the forceps can be useful in holding and cutting the sections without causing any harm to the hands. Hand tools avoid the direct contact with the microorganisms in medical laboratory thus protect against infections. Hand tools aid in surgical operations and they help in avoiding direct contact with the blood vessels and organs preventing contamination and infections.

Answer:

A attractive field pulls and pushes electrons in certain objects closer to them, making them move. Metals like copper have electrons that are effortlessly moved from their circles. In case you move a magnet rapidly through a coil of copper wire, the electrons will move - this produces power.

Answer:

5 m/s

Explanation:

hope it helps:) u're welcome

The velocity of the duck must be 15 m/s towards the east which is explained below.

The force on a moving charge with some velocity under a magnetic field is given by:

F = qv×B

here q is the charge on the object

v is the velocity of the object

B is the magnetic field

v×B gives the direction of the force

B is towards the north, and Force is directed upwards, then velocity v should be towards the east.

3×10⁻¹¹ = 4×10⁻⁸× v × 5×10⁻⁵

v = 15 m/s

Learn more about magnetic force:

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Answer:

Day when I workout I feel I have more energy, but on days when I don't I feel sluggish and tired

Answer:

cellular respiration

Explanation:

Answer:

p = 0

Explanation:

Given that,

Mass of beetle, m = 750 kg

It was rest. It means its speed is equal to 0.

The momentum of an object is equal to the product of mass and velocity. So,

p = mv

p = 750 × 0

p = 0 kg-m/s

So, the momentum of the beetle is 0 kg-m/s.

Answer:

Pressure increases

Explanation:

"Gay Lussac's Law - states that the pressure of a given amount of gas held at constant volume is directly proportional to the Kelvin temperature. If you heat a gas you give the molecules more energy so they move faster. This means more impacts on the walls of the container and an increase in the pressure."

Answer:

The first factor is the amount of charge on each object. The greater the charge, the greater the electric force. The second factor is the distance between the charges. The closer together the charges are, the greater the electric force is.

Explanation:

Although X-rays have many benefits, they can be dangerous to human health because they are short wavelength, high frequency, with photons sufficiently energetic to damage DNA molecules.

Permanent magnets are important for their industrial uses especially when it comes to power generation and electric motors. The induction process for turbines and generators needs permanent magnets to turn mechanical motion into energy.

Exposing magnetized magnets to opposing external fields produces a demagnetizing effect. This effect is most apparent in permanent magnet materials having a non-linear demagnetization curve, such as Alnico. ... Other factors such as SHOCK and VIBRATION have very little effect on today's permanent magnet materials.

Answer:

sping constant is the force needed to stretch or compress a string

The formula:

Fs=-kx

Fs= force

k= spring constant

x= amount of extension

Answer:

Explanation:

The Himalayan mountain range and Tibetan plateau have formed as a result of the collision between the Indian Plate and Eurasian Plate which began 50 million years ago and continues today. 225 million years ago (Ma) India was a large island situated off the Australian coast and separated from Asia by the Tethys Ocean.

Answer:

E =  = 17

Explanation:

We will use the equation E =  We plug in our known values

Answer:

The gas will change to a liquid

Explanation:

Basically condensation happens

Answer:

A. True it's right solids have a definite shape and volume.

Answer:

Explanation:

Yes , their displacement may be equal .

Suppose the displacement is AB where A is starting point and B is end point .

The car is covering the distance AB by going from A to B on straight line . On the other hand plane goes from A to C , then from C to D and then from D to B . In this way plane reaches B from A on a different path which is longer than path of the car . In the second case also displacement of plane is AB . In the second case distance covered is longer but displacement is same that is AB .

Answer:

Radio

Explanation:

As the stonger the waves get the more compressed they get

Answer:

Required distance is 103 miles and the required time is 1 hour

Explanation:

Given;

speed of the car, v = 103 miles per hour

Speed is the given as the ratio of distance traveled to time taken for the motion.

The distance it will take another car to catch up to them from a complete stop is 103 miles and the time it will take the car is 1 hour.

Therefore, required distance is 103 miles and the required time is 1 hour.