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3 years ago

________ sensations inform us of the position of the head in space by monitoring gravity, linear acceleration,and rotation.

1 answer:

4 0

The answer would be Vestibular Senses. Consciousness of body equilibrium and movement are checked by the vestibular system. The vestibular senses (the feelings of body rotation and of attraction and gravity) ascend in the inner ear; the sense organs are the hair cells that give off signals done in the auditory nerve.

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A student walked 2km in .5 hours what is his average speed on the way to school

ddd [48]

Speed = Distance%Time

Speed is 0,4km/h

5 0

3 years ago

A rock is tossed straight up from ground level with a speed of 22 m/s. When it returns, it falls into a hole 9.0 m deep. a. What

Vera_Pavlovna [14]

Answer:

(a) $v_{f}=26.08m/s$

(b) $t=4.906seconds$

Explanation:

We will take ground level as origin and upward is positive direction

the givens are

$y_{i}=0\\y_{f}=-9.0m\\ v_{i}=22m/s$

Part (a)

To find the final velocity we use the kinematic equation

$(v_{f})^{2} =(v_{i})^{2} +2a(y_{f}-y_{i})\\(v_{f})^{2}=(22m/s)^{2}+2(-9.8m/s^{2} ) (-10-0)\\v_{f}=\sqrt{(22m/s)^{2}+2(-9.8m/s^{2} ) (-10-0)} \\v_{f}=26.08m/s$

Part (b)

To find time of rock trip until it touches the ground we will use simple kinematic equation or simple motion equation

$v_{f}=v_{i}+at\\t=\frac{v_{f}-v_{i}}{a}\\ t=\frac{(-26.08m/s)-(22m/s)}{-9.8m/s^{2} }\\t=4.906seconds$

Notice that we substituted vf with negative sign because its direction is downwards

5 0

3 years ago

A light beam travels at 1.94×108 in quartz. The wavelength of the light in quartz is 355 .Part AWhat is the index of refraction

Alja [10]

A) 1.55

The speed of light in a medium is given by:

$v=\frac{c}{n}$

where

$c=3\cdot 10^8 m/s$ is the speed of light in a vacuum

n is the refractive index of the material

In this problem, the speed of light in quartz is

$v=1.94\cdot 10^8 m/s$

So we can re-arrange the previous formula to find n, the index of refraction of quartz:

$n=\frac{c}{v}=\frac{3\cdot 10^8 m/s}{1.94\cdot 10^8 m/s}=1.55$

B) 550.3 nm

The relationship between the wavelength of the light in air and in quartz is

$\lambda=\frac{\lambda_0}{n}$

where

$\lambda$ is the wavelenght in quartz

$\lambda_0$ is the wavelength in air

n is the refractive index

For the light in this problem, we have

$\lambda=355 nm\\n=1.55$

Therefore, we can re-arrange the equation to find $\lambda_0$ , the wavelength in air:

$\lambda_0 = n\lambda=(1.55)(355 nm)=550.3 nm$

4 0

4 years ago

3. A car has a mass of 1000kg. What is its weight? A) 9.81x10 ^ 3N B) 1.89x10 ^ 3N

Strike441 [17]

Answer

Explanation:

Weight = Mass x Acceleration due to gravity

Weight = 1000 x 9.81

= 9810 or 9.81x10^ 3

6 0

3 years ago

Which of the following statements are true and supported by kinetic molecular theory?

Margarita [4]

Answer:

I,II, III are true

Explanation:

1. Yes

low pressure reduces the inter molecular attraction force and cause non-ideality

at high temperature frequency of collision is increase that causes loss of energy.

2. yes

$v_{rms}=\sqrt{\frac{2RT}{M} }$

T is temperature , more the T more will be the velocity of molecules and hence more kinetic energy.

3. Yes

Polar gases contain stronger inter molecular forces from reliable, measurable partial charges, which implies that they are more permanent, long-lasting, and therefore more prominent forces.

4. No

higher the temperature higher will be the pressure as the frequency of collision will increase and thus increasing the pressure.

6 0

3 years ago