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3 years ago

While running at a constant velocity, how should you throw a ball with respect to you so that you can catch it yourself?

1 answer:

5 0

You are running at constant velocity in the x direction, and based on the 2D definition of projectile motion, Vx=Vxo. In other words, your velocity in the x direction is equal to the starting velocity in the x direction. Let's say the total distance in the x direction that you run to catch your own ball is D (assuming you have actual values for Vx and D). You can then use the range equation, D= (2VoxVoy)/g, to find the initial y velocity, Voy. g is gravitational acceleration, -9.8m/s^2. Now you know how far to run (D), where you will catch the ball (xo+D), and the initial x and y velocities you should be throwing the ball at, but to find the initial velocity vector itself (x and y are only the components), you use the pythagorean theorem to solve for the hypotenuse. Because you know all three sides of the triangle, you can also solve for the angle you should throw the ball at, as that is simply arctan(y/x).

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The shanghai maglev train is capable of reaching speeds of up to 350km h-1 what is the speed in m/h

LenaWriter [7]

Answer:

The shanghai maglev train is capable of reaching speeds of up to 217.48 in mph

217.48 mph

Explanation:

8 0

3 years ago

a mercury in glass thermometer reads -20° at the ice point and 100°at the steam point. calculate the Celsius temperature corresp

Anestetic [448]

Answer:

120 deg Unknown = 100 deg Celsius since we know that the ice point is at

0 deg Celsius and the steam point is 100 deg Celsius

So you have 1.2 deg U / 1 deg C

70 deg U / (1.2 deg U / 1 deg c) = 58.3 deg C (temperature in deg Celsius)

Or 58.3deg C * 1.2 deg U / 1 deg C = 70 deg U

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3 years ago

A sample of water in equilibrium with its vapor in a closed 0.6-L container has a vapor pressure of 23.8 torr at 25°C. The conta

Lyrx [107]

Answer:

Explanation:

Given data:

vapor pressure P_1 = 0.6 L

Volume = 2L

Temperature remain constant

No change in vapor pressure. This is because vapor pressure is calculated from the temperature of the liquid and not the volume of the container. Since the temperature is constant therefore vapor pressure remian constant..

8 0

3 years ago

Find the energy of one quantum of microwave radiation with frequency 4 GHz and with 500 GHz .

REY [17]

Answer:

1. $1.65*10^{-5} eV$ and $2.07*10^{-3}eV$ 2. $2.10*10^{-7}m$

Explanation:

The energy of a photon is given by the so-called Planck-Einstein relation:

$E=fh=\frac{ch}{\lambda}$

where E is the energy, f the frequency, $\lambda$ the wavelength, c the speed of light and h the planck constant

So, we have:

$E=fh\\E=(4*10^9Hz)(4.136*10^{-15}eV*s)=1.65*10^{-5} eV\\$

And:

$E=fh\\E=(5*10^{11}Hz)(4.136*10^{-15}eV*s)=2.07*10^{-3} eV\\$

2. The work function is the amount of energy required to remove an electron from the material. Therefore the kinetic energy of the photoelectrons will be the energy of the electromagnetic radiation minus the work function:

$K=E-W$