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Burka [1]
3 years ago
9

water is a molecule of oxygen and hydrogen. The bonds that hold water molecules together are due to shared what

Physics
1 answer:
Olenka [21]3 years ago
8 0
The bonds that hold water molecules together are due to shared electrons. Hope I helped!
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A few years ago, Serena Williams dived to hit a tennis ball right after it bounced off the ground. The ball bounced on the groun
pshichka [43]

Answer:

The initial velocity of the ball was 20 m/s

Explanation:

Please, see the figure for a description of the problem.

The initial velocity vector can be written as follows:

v0 = (v0x, v0y)

where:

v0 = initial velocity

v0x = horizontal component of the initial velocity

v0y = vertical component of the initial velocity

The position and velocity of the ball at time "t" are described by the vector "r" and "v" respectively:

r = (x0 + v0x * t, y0 + v0y * t + 1/2 * g * t²)

v = (v0x, v0y + g*t)

Where:

r = position vector of the ball

x0 = initial horizontal position

t = time

y0 = initial vertical position

g = acceleration due to gravity

v = velocity vector

Considering the center of our system of reference as the point at which the ball left Serena´s racket, x0 and y0 = 0.

We know that at a time t = 1.21 s the y-component of the position vector must be 0 (see "r final" in the figure). Then:

y0 + v0y * t + 1/2 * g * t² = 0          y0= 0

v0y * 1.21 s + 1/2 * (-9.8 m/s²) * (1.21 s)² = 0

v0y = -(1/2 * (-9.8 m/s²) * (1.21 s)²) / 1.21 s

v0y = 1/2 * 9.8 m/s² * 1.21 s

v0y = 5.93 m/s

If we see in the figure the trajectory of the ball if there had been no gravity ("s"), we will notice that it is a stright line with a slope of:

Δy/Δx = (0.95m(y) + 2.63m(y)) / 11.7 m(x) = 0.31 m(y) / m(x)

This slope means that the ball will go up 0.31 m for every meter it goes right.

Then, if initially the ball goes up 5.93 m every second, it will go right

(5.93 m(y) * (1 m(x) / 0.31 m(y)) = 19.1 m(x). Then, v0x = 19.1 m/s

The vector initial velocity will be:

v0 = (19.1 m/s, 5.93 m/s)

magnitude of v0 =|v0| = \sqrt{(19.1m/s)^{2}+(5.93m/s)^{2}}= 20.0 m/s

Another way to solve this is by using the equation for velocity:

We know that when the ball passes over the net, the vertical velocity is 0. Then, we can calculate the time at which the ball passes over the net and use that time to obtain v0x from the equation for position, since we know that at that time the x-component of the position is 11.7 m.

When the ball is over the net:

v0y + g*t = 0

t = -v0y/g = -5.93 m/s/-9.8 m/s² = 0.61 s.

Notice that, since the trajectory is a parabola, knowing the final time we could easily calculate the time at which the ball passes the net by dividing that final time by 2: 1.21 s / 2 = 0.61 s

Then, using this time in the equation for position:

v0x * t = 11.7 m

v0x = 11.7 m / 0.61 s = 19.2 m/s which is aproximately the same as the obtained above.

7 0
3 years ago
An electron (charge - 1.6 ´ 10 - 19 C) moves on a path perpendicular to the direction of a uniform electric field of strength 3.
arlik [135]

Answer:

Explanation:

The charge on the electron is

q=1.6×10^-19C

It moves in a path perpendicular to the electric field

Given that the uniform electric field is

E=3N/C.

We need to calculate Work

Distance moved is

d=15cm=0.15m

W=q ∫E.ds

Thus, the angle θ between the path and electric field is 90°, and the dot product E.ds is zero

E.ds= Eds Cos θ= Edscos90

Cos 90=0

Then E.ds=0

Now,

W=q ∫E.ds

W=q × 0

W=0J

8 0
3 years ago
Momentum = ___________.
posledela
The answer must be a mass x velocity
4 0
3 years ago
How long will it take a car to go from 0 to 45 km/hr if they are accelerating at 5 km/hr/s?
Mandarinka [93]

Answer:

9 seconds

Explanation:

acceleration =  \frac{final \: speed - initial \: speed}{time \: taken}

5km/ hr/ s =  \frac{45 - 0 (km/ h)}{t}

cross multiplying

5t = 45 secs \\ t = 9 \: secs

it will take 9secs for the car to go from 0 to 45 km/ h

4 0
2 years ago
What is the mass of an object if a force of 34 N produces an acceleration of 4 m/s^2?
Paha777 [63]
F=ma

F/a=m

34/4 =8.5

8.5 kilograms
8 0
3 years ago
Read 2 more answers
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