Without oxygen, there would not any fire and the combustion process in our vehicles would stop. Every mode of transport except electric would fail instantly. Planes flying high in the sky would fall on earth and millions of cars running on petrol and diesel would stop on the roads.
We have to employ Newton's Second Law and Third Law here: force = mass * acceleration, and every force produces an equal and opposite force.
—The forces vertically are EQUAL, so no acceleration is occurring in this direction. This also means that the force of gravity and the normal force must be equal in magnitude.
—The forces horizontally are NOT equal, so there will be acceleration on this box in this direction. The applied force is going to be larger than the friction force, and the friction force opposes the direction of the applied force.
First, we find the weight of this box, which is given by mass * acceleration due to gravity. On Earth, acceleration due to gravity is about 9.8 m/s^2.
So, 70 kg * 9.8 m/s^2 = 686 N. This force points downwards.
The normal force is equal in magnitude to this, so it is also = 686 N, but points upwards.
The force of friction is given by force(friction) = µ * force(normal). In this problem, µ = 0.50. Then, we plug in to get 0.50 * 686 N = 343 N. This is the force of friction that opposes the motion of the box.
And finally, we are given the applied force, which is 400 N.
Now we make a Newton's second law equation.
force(applied) - force(friction) = mass * acceleration
400 N - 343 N = 70 kg * a
a = .8142 m/s^2
I really hope this is the right answer; it's 4 AM for me lol
Less stressed. oHFEUOGvszoHqwgejwvnojvdnwaondvodvns
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Among the choices provided above the one that best represents the speed of Halley's comet when it is nearest to Earth is letter D which is <span>1 × 10^5 kilometers per hour. </span>
Answer:
Since the Kinetic energy forumla is K=(1/2)mv^2 if you double the mass the kinetic energy of the object also doubles. for example if your object has a mass of 3 and a velocity of 2 then its K.E. equals 6, if you then double its mass the kinetic energy now equals 12. A good analogy would be something like a bowling ball, if you throw a 12 pound ball at the same speed as a 6 pound ball, the force from the 12 pound ball would be exactly double to the 6 pound ball.
Explanation:
man, english isnt my strong suit. you have all you need here to make a A level answer just fix grammar as needed. I cant imagine this is a high level physics class so in reality just make it so it would be plagirsm detected.
Also a side note this may help you in the future. if u double its velocity its K.E. actually quadruples since V is squared.
