All categories

2 years ago

Your English teacher runs 0.80 km north and 1.20 km west. What is the magnitude of the resultant vector of this position?

Physics

1 answer:

Stella [2.4K]2 years ago

5 0

Answer:

Answer: B

${ \rm{resultant = \sqrt{ {d _{1} }^{2} + {d _{2}}^{2} } }}$

d1 is 0.80 km
d2 is 1.20 km

${ \rm{resultant = \sqrt{ {(0.80)}^{2} + {(1.20)}^{2} } }} \\ = { \rm{ \sqrt{2.80} }} \\ { \boxed{ \mathfrak{ \: \: answer = { \rm{1.44 \: km}}}}}$

You might be interested in

Which Period 2 element would you expect to have the highest electrical and

evablogger [386]

The answer is c nitrogen thx me later

4 0

3 years ago

A rock is dropped from the top of a vertical cliff and takes 3.00 s to reach the ground below the cliff, A second rock is thrown

Tcecarenko [31]

Answer:

12.25m/s

Explanation:

$d=v_ot+\dfrac{1}{2}at^2$

Since the initial velocity of the dropped rock is 0, you can write this as:

$d=\dfrac{1}{2}(9.8)(3)^2=44.1m$

Now, you can set up the equation for the thrown rock:

$44.1=v_o(2)+\dfrac{1}{2}(9.8)(2)^2 \\\\\\44.1=2v_o+19.6 \\\\\\2v_o=24.5 \\\\\\v_o=12.25m/s$

Hope this helps!

3 0

2 years ago

The graph shows the solubility of several different compounds in water. According to the graph, which compound can form a satura

kumpel [21]

Answer is A. NaCIO3.

3 0

3 years ago

Elephants can communicate over distances as far as 6 km by using very low-frequency sound waves. What is the wavelength of a 10

harkovskaia [24]

The characteristics of the sound waves allow to find the result for the wavelength is:

λ = 34.29 m

The sound wave is a longitudinal traveling wave, where the speed of the wave depends on the air temperature.

v = $v_o \sqrt{1 + \frac{T}{273} }$

where v₀ is the speed of sound for T = 0ºc v₀ = 331 m / s.

indicate that the temperature is T = 20ºC, let's find the speed of the traveling wave.

v = 331 $\sqrt{1 + \frac{20}{273} }$

v = 342.9 m / s

The speed of sound is related to wavelength and frequency.

v = λ f

λ = $\frac{v}{f}$

Let's calculate

$\lambda = \frac{342.29}{10}$

λ = 34.29 m

In conclusion using the characteristics of sound waves we can find the result for the wavelength is:

λ = 34.29 m

Learn more here: brainly.com/question/21995826

3 0

2 years ago

A car is cruising at a steady speed of 35 mph. Suddenly, a cuddly puppy runs out into the road. The driver takes 1.7 seconds to

Schach [20]

Answer:

The distance traveled is 0.037 mi

Explanation:

The equation for the position and velocity of an accelerated object is:

x = x0 + v0 * t + 1/2 * a * t²

v = v0 + a * t

where

x = position at time t

x0 = initial position

t = time

a = acceleration

v0 = initial velocity

If the velocity is constant, then a = 0 and the position will be:

x = x0 + v * t where "v" is the velocity

First, let´s find the distance traveled until the driver push the brake:

The speed is constant. Then:

x = x0 + v * t (considering the origin of the reference system to be located at the point at which the driver sees the puppy, x0 = 0)

x = 35 mi/h (1 h / 3600 s) * 1.7 s = 0.017 mi

Then, the drivers moves with constant acceleration until the car stops (v = 0)

From the equation for velocity:

v = v0 + a * t

Since v = 0, we can obtain the acceleration of the car until it stops. With that acceleration, we can calculate how much distance the car moves before it stops.

0 = v0 + a * t

-v0 / t = a

-35 mi/h (1 h / 3600s) / 4.0 s = a

a = -2.4 x 10⁻³ mi/s²

The distance traveled will be:

x = x0 + v0 * t + 1/2 * a * t²

Now x0 will be the distance traveled before the driver slows down.

x = 0.017 mi + 35 mi/h (1 h / 3600s) * 4 s + 1/2 * ( -2.4 x 10⁻³ mi/s²) * (4s)²

x = 0.037 mi

6 0

3 years ago