Letícia leaves the grocery store and walks 150.0 m to the parking lot. Then, she turns 90° to the right and walks an additional 70.0 m to her car. What is the magnitude of the displacement of her car from the grocery store exit? Round your answer to the nearest tenth.


Answer 1
Answer: So you need to find the resulting length between the two distances. If you look at the two vectors as components of a right triangle then you can use Pythagorean theorem to solve for the last side. it is simply   which equals 165.5
Answer 2


165.5 m


In this problem, we have two displacements:

- A first displacement of 150.0 m forward

- A second displacement of 70.0 m to the right

The two displacement are in perpendicular direction, so in order to calculate the resultant displacement, we can use the Pytagorean theorem (in fact, the two displacements are the sides of a right triangle, and the hypothenuse corresponds to the magnitude of the resultant displacement).

Therefore, the magnitude of her total displacement is:

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5. Define the terms comet, asteroid, and meteoroid.




It is a celestial body constituted by ice, dust and rocks that orbit around the Sun, after having been altered by the Oort cloud; following different trajectories that can be highly eccentric elliptical (periodic trajectories), parabolic or hyperbolic.

One of the main characteristics of a comet is that it travels quite fast, on its way around the Sun and has a long tail, which always go in the opposite direction to the Sun (due to the radiation pressure of sunlight).


It is a small rocky body (smaller than a planet and larger than a meteoroid). Most of these bodies are orbiting between Mars and Jupiter in the region known as the asteroid belt; while others accumulate at Jupiter's Lagrange points, and others cross the orbits of the planets.


It is a fragment of the celestial body that moves through space, which is smaller in size to an asteroid. If it gets to enter the atmosphere of the Earth, it will start to burn by friction with it (combustion) and it will be called a meteor, while if it hits the surface, it will be called a meteorite.

Comets are loose collections of ice, dust, and small rocky particles whose orbits are usually very long and narrow


A 200.0 g copper block absorbs 2.34 × 10^3 J of heat to raise its temperature by 30.0 K. What is the specific heat of copper? Please show your work/all the steps.


Answer: 0.39 Jg/K


Q = heat gained =

m = mass of the substance = 200 g

c = heat capacity of copper = ? J/g ° C      


Thus specific heat of copper is 0.39 Jg/K.

Specific heat = Heat / (mass x change in temperature)

specific heat= 2.34 x 10^3 / 200 x 30

specific heat = 2,340 / 6,000

Specific Heat= 0.39


The case whereby sound waves are heard at either a higher or lower pitch due to an object's motion is called: the Doppler effect
shock waves



the Doppler effect


The doppler effect is what we called the effect that happens when the wavelength or frequency of a sound changes because the observer is moving relatevily form the object, could be moving closer or moving further away, but the wavelenght and the frequency changes alongside with the movement.

Doppler effect!!!!!!!!!!!!!!!!!!!!!!!!!!!!! ! ! ! ! ! ! ! ! ! ! ! !

A proton beam in an accelerator carries a current of 106 μa. if the beam is incident on a target, how many protons strike the target in a period of 17.0 s?


The electric current is defined as the charge Q that passes a certain point in a time :

We know the current, , and the time, , so the total charge that strikes the target during this time is

To find the number of proton, we must divide the total charge by the charge of a single proton, which is :

And this is the number of protons that strike the target in 17.0 s.
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