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Romashka [77]
4 years ago
13

a car advertisement claims that a car can accelerate from rest to 70 km/hr in 7 seconds (hint convert to hours first) find the c

ars acceleration ​
Physics
1 answer:
Andrews [41]4 years ago
5 0

2.77 m/s^2

70 km/hr * 1 hr/60 sec * 1000 m/km = 19.44 m/s

accel. = (V(f) - V(i))/t

          = 19.44 / 7

accel. = 2.77 m/s^2

And by the way, this car sucks!!!!!!

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Marisa does 3.2J of work to lower the window shade in
Pani-rosa [81]

Work is considered as the Force performed on a body to move it a certain distance, that is

W = Fd

Here

W = Work

F = Force

d = Distance

In this case we have the values of work and distance, therefore clearing for the Force we would have to

F = \frac{W}{d}

Replacing,

F = \frac{3.2J}{8m}

F = 0.4N

Therefore the force that Marissa must exert on the windows shade is 0.4N

5 0
3 years ago
What is the advantage in solving motion problems using energy conservation principles instead of free body diagrams
riadik2000 [5.3K]

Answer:

However, the disadvantages are:

1. Many atimes for some motion prolems, free-body diagrams has to be drawn many times so to have enough equations to solve for the unknowns. This is not the same with energy conservation principles.

2. In situations where we need to find the internal forces acting on an object, we can't truly solve such problems using free-body diagram as it captures external forces. This is not the same with energy conservation principles.

Explanation:

Often times the ideal method to use in solving motion problem related questions are mostly debated.

Energy conservation principles applies to isolated systems are useful when object changes their positions in moving upward or downward converts its potential energy due to gravity for kinetic energy, or the other way round. When energy in a system or motion remains constant that is energy is neither created nor destroyed, it can therefore be easier to calculate other unknown paramters like in the motion problem velocity, distance bearing it in mind that energy can only change from one type to another.

On the other hand, free body diagram which is a visual representation of all the forces acting on an object including their directions has so many advantages in solving motion related problems which include finding relationship between force and motion in identifying the force acting on a body.

5 0
3 years ago
Which of the following statements accurately describes a parallel circuit? Select all that apply.
laila [671]

Answer:

The current splits at junctions and follows different paths through the circuit.

Every resistor in the same branch of the circuit experiences the same current through it.

The total resistance of the circuit decreases as more resistors are added to it.

Explanation:

5 0
3 years ago
An isotope undergoes radioactive decay by emitting radiation that has no mass. What other characteristic does the radiation have
vitfil [10]

Other characteristic of radiation is the presence of positive and negative charge.

<h3 /><h3>What other characteristic does the radiation have?</h3>

Positive or negative charge are the other characteristic that is present in the radiation. Beta radiation have negative charge while on the other hand, alpha radiation have positive charge.

So we can conclude that other characteristic of radiation is the presence of positive and negative charge.

Learn more about radiation here: brainly.com/question/893656

#SPJ1

4 0
2 years ago
What are Radio Waves?
AfilCa [17]
Radio waves are electromagnetic waves with wavelengths of 1 millimeter or more . . . frequencies of 300 GHz or less.
5 0
3 years ago
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