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3 years ago

A student walks 3

Physics

1 answer:

pochemuha3 years ago

8 0

Answer: The speed of the student is 5.45km/hr.

Explanation: The important concept here is to convert 33 minutes to hours by diving by 60 since one hour is equal to 60 minutes to get 0.55hr

Then velocity is equal to distance over time.

v=d/t

v= 3km/0.55hr

v=5.45km/hr

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As viewed from our location, the stars of the Big Dipper canbe connected with imaginary lines to form the shape of a pot with ac

jasenka [17]

Answer: California

Explanation:

The Big Dipper has eight stars in it. Seven are visible at a glance, while the eighth is a visible double star that is just detectable with the naked eye in an area with clear "seeing" and with good vision.

To first observe an easily recognizable change in the shape formed by these stars (to an observer without a telescope), someone can look high in the sky toward the northeast at a certain time of the year and you can't miss the Big Dipper at around 8 p.m from mid-northern latitudes which is California

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4 years ago

An electric vehicle starts from rest and accelerates at a rate of 2.0 m/s2 in a straight line until it reaches a speed of 20 m/s

andreyandreev [35.5K]

a. How much time elapses from start to stop
v = u + at
20 = 0 + 2t1
t1 = 10 sec

2nd phase:
v = u - at
0 = 20 - 1 x t2
t2 = 20 sec

total time = t1+t2 = 10 + 20 = 30 sec

b.1st phase:
s = ut + 1/2at^2
s1 = 0 + 1/2 x 2 x (10)^2
s1 = 100 m

2nd phase:
By s = ut - 1/2at^2
s2 = 20 x (20) - 1/2 x 1 x (20)^2
s2 = 200 m
total distance(s) = s1+s2 = 100 + 200 = 300 m

hope this helps

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4 years ago

Jeremy was asked to describe the impact of humans on the carbon cycle. He answered: "When people

zmey [24]

Answer:

Humans add carbon dioxide to the atmosphere when they burn fuel in factories and other biomass sources. Humans take in carbon from the food they eat from the soil and return it back to the soil through waste products and decomposition.

Explanation:

When humans add carbon into the atmosphere the main contributors are burning of substances like fuels and biomass and from eating.

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3 years ago

A student swings back and forth from position A to C, as shown. Which of the following happens when the swing moves from Positio

anygoal [31]

Answer:[] Both potential energy and kinetic energy of the student increase.

Explanation:

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3 years ago

Read 2 more answers

If a nucleus decays by successive b, a, a emissions, its mass number will Group of answer choices decrease by seven. decrease by

nirvana33 [79]

Answer:

The mass number will decrease by eight (8).

Explanation:

Given;

successive beta (b), alpha (a), alpha (a) emissions.

Generally, when a radioactive element emits a beta-particle (b), its mass number doesn't increase but its atomic number increases by 1 . $(^{0}_{-1}\beta )$

Also when a radioactive element emits an alpha-particle (a), its mass number decreases by 4, while its atomic number decrease by 2. $(^4_2\alpha)$

For the given question, a successive beta (b), alpha (a), and alpha (a) emissions = (0) + (-4) + (-4) = -8

Thus, when a radioactive element emit a successive beta (b), alpha (a), alpha (a) particles, the mass number will decrease by eight (8).

To learn more, please visit: brainly.com/question/23276969

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3 years ago