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ludmilkaskok [199]
3 years ago
15

An American Red Cross plane needs to drop emergency supplies to victims of a hurricane in a remote part of the world. The plane

is traveling horizontally at 100.0 m/s at a height of 50.0 m above the ground. What horizontal distance does the package travel before striking the ground?

Physics
1 answer:
Andreas93 [3]3 years ago
3 0
Refer to the diagram shown below.

Assume that air resistance is ignored.

Note:
The distance, h, of a falling object with initial vertical velocity of zero at time t is
h = (1/2)gt²
where
g = 9.8 m/s²

The initial vertical velocity of the supplies is 0 m/s.
It the time taken for the supplies to reach the ground is t, then
(50 m) = (1/2)*(9.8 m/s²)*(t s)²

Hence obtain
t² = 50/4.9 = 10.2041
t = 3.1944 s

The horizontal distance traveled at a speed of 100 m/s is
d = (100 m/s)*(3.1944 s) = 319.44 m

Answer: 319.4 m (nearest tenth)

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A student attaches a 20 ohm resistor to a battery and measures a current of 0.30 A. What is the voltage of the battery?
Sati [7]

Answer:6v

Explanation:

Current=0.30A

Resistance=20ohms

voltage=current x resistance

Voltage=0.30 x 20

Voltage=6v

4 0
2 years ago
Convection currents occur in fluids because of temperature and______ differences. Convection currents transfer ______ energy thr
Alex777 [14]

Solution: (i) Density (ii) thermal

Liquids at lower temperatures have greater density when compared to liquids at higher temperatures.This is because, at higher temperatures, molecules have greater kinetic energy and hence they are spaced farther apart, when compared to molecules at lower temperatures. Thus, the colder layers of liquids are heavier than the warmer layers, which causes then to move down due to gravity. For the same reason, the hotter layers move upwards through the liquid.

When a liquid is heated, the molecules closest to the heat source have greater energy, their density becomes less and they move upwards. The colder layers sink downwards. The layers of the liquid which were cold initially, get heated and they travel upwards. As the process repeats, convection currents are set up in the liquid.

These currents transfer the thermal energy derived from the source throughout the liquid. The process stops when the entire liquid is at the same temperature.

Thus, convection currents occur in liquids due to temperature and <u>density</u> differences. Convection currents transfer <u>thermal</u> energy throughout a fluid.

5 0
3 years ago
Read 2 more answers
A frame hanging on a wall is held by two cables. The tension in each cable is 30 N, and the cables make an angle of 45° with the
Vesna [10]

Answer:

(D) 42.4N

Explanation:

Since the frame is at rest, the net force acting on it must be 0. There are three forces acting on it: the gravity and the opposing forces of the two cables.

Since the gravity is a vertical force, we are only interested in the vertical components of the remaining forces. The net force equation is

F_net = 0 = F_g -2 * F_y

The vertical force of one cable (using the information in the drawing) is:

F_y = 30N * sin 45 deg = 21.21N

Now the weight can be determined:

0 = F_g - 2 * F_y

F_g= 2 * F_y = 2 * 21.21N = 42.4N

The weight of the frame is about 42.4N.


6 0
3 years ago
Read 2 more answers
If a 2 meter diameter ball representing the Sun were placed in Center Circle in Indianapolis, how far away should the Earth be p
fgiga [73]

By applying the correspondent change of scale, we will see that Earth should be placed 214.8m away from the scale sun.

<h3></h3><h3>How far the Earth should be placed?</h3>

The real radius of the Sun is:

R = 696,340 km

And the radius of the scale Sun is 1m, then we have the relation:

1m = 696,340 km

1 = (1m/696,340 km)

Now, the real distance between the Sun and Earth is:

d = 149,600,000 km

If we apply the change of scale we have above, we will get:

d =  149,600,000 km*(1m/696,340 km) = 214.8m

So the Earth should be placed at 214.8m of the ball that represents the sun.

If you want to learn more about changes of scale, you can read:

brainly.com/question/15891755

6 0
2 years ago
A motorcycle travels at 6.0 m/s. After 3.0 seconds, the motorcycle travels at 15.0 m/s.
Dmitriy789 [7]

Answer:

a=?

Vf=15.0m/s

Vi=6.0m/s

t=3.0s

a=Vf-Vi/t

a=15.0-6.0/3.0

a=9/3

a=3m/s^2

Explanation:

3 0
3 years ago
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