A stone is launched from the ground, at a 70° angle, with an initial velocity of 120 m/s.

Physics

2 answers:

Volgvan2 years ago

4 0

Answer:

x = 41t is correct

Explanation:

The horizontal component of the rock's velocity is 120(cos70°). You would plug the time the rock landed into this equation.

zavuch27 [327]2 years ago

3 0

<span>A) x = 41t
The classic equation for distance is velocity multiplied by time. And unfortunately, all of your available options have the form of that equation. In fact, the only difference between any of the equations is what looks to be velocity. And in order to solve the problem initially, you need to divide the velocity vector into a vertical velocity vector and a horizontal velocity vector. And the horizontal velocity vector is simply the cosine of the angle multiplied by the total velocity. So H = 120*cos(70) = 120*0.34202 = 41.04242 So the horizontal velocity is about 41 m/s. Looking at the available options, only "A" even comes close.</span>

You might be interested in

If a sound wave travels 680 m in 2 seconds and has a frequency of 400 hz, what is the wavelength of the wave?

Kipish [7]

Answer: 0.85 meters (with and without sigfigs)

Explanation: To find the wavelength, you just have to switch around the equation for wave speed: v (wave speed) = λ (wavelength)*f (frequency) so λ (wavelength) = v (wave speed)/f (frequency). You don't have the wave speed but you can calculate it. Since wave speed is measured in meters/second or m/s, you just have to divide the amount of meters you were given by the amount of seconds. You will get 340 m/s. Next, you have to plug the values into the equation: λ (wavelength) = 340 m/s (wave speed)/400 Hz (frequency). The answer is 0.85 meters (seconds cancel) and has the correct number of significant figures.

5 0

2 years ago

An experiment is performed in the lab, where the mass and the volume of an object are measured to determine its density. Two com

navik [9.2K]

Answer:

d. the same within the uncertainty of each measurement method

Explanation:

The density of an object and in general any physical property, has the same value regardless of the method used to measure it, either directly or indirectly. Since two completely different valid methods are used, the results must be the same, taking into account the level of precision of each of the methods.

8 0

3 years ago

Is this right? Please help me

prohojiy [21]

Answer:

It would be C

Explanation:

The brain operates on two levels, one of them is unconscious.

6 0

2 years ago

Read 2 more answers

Only humans have critical periods

irinina [24]

Is that a question what is that supposed to mean

7 0

3 years ago

Read 2 more answers

A man weighing 800 newtons is standing on a chair. In order to support the man, the chair is exerting a force of.

san4es73 [151]

The chair is exerting a force of 800N.

Force is a quantity that is used to describe the interaction between two objects. Forces can cause objects to accelerate, decelerate, or change direction. In other words, forces can cause objects to move or change the way they are moving. The weight of an object is a measure of the force of gravity on that object and is calculated by multiplying the object's mass by the acceleration due to gravity.

In the given case, It would need a force equal to his weight (800 N) pressing in the opposite direction for the man to be able to rise up in the chair. Therefore, the 800 N force would be pushed upwards if he were to press down by standing on it.