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1 year ago

A bicyclist, initially at rest, begins pedaling and gaining speed steadily for 4.90s during which she covers 32.0m.

Physics

1 answer:

harina [27]1 year ago

3 0

Answer:

CHAPTER 1

Conceptual Problems

C1. A room in a house has a floor area of 120 ft2

. Which of the following is most likely the

approximate volume of the room?

a. 3 m3

b. 30 m3

c. 300 m3

d. 3 000 m3

C2. When SI units are plugged into an equation, it is found that the units balance. Which of the

following can we expect to be true for this equation?

a. The equation will be dimensionally correct.

b. The equation will be dimensionally correct except sometimes in cases when the right

hand side of the equation has more than one term.

c. The equation will not be dimensionally correct.

d. All constants of proportionality will be correct.

C3. How long has it been that scientists have accepted that the nucleus of the atom consists of

neutrons and protons? Think of your answers in terms of order of magnitude.

a. about a decade

b. about a century

c. about a thousand years

d. since Aristotle

C4. Consider the sine of any angle between 30°

and 40°

. If the angle were doubled, what would

happen to the sine of the angle?

a. It would double.

b. It would more than double.

c. It would increase but be less than double.

d. In different cases, it could do any of the above.

C5. There are other ways of expressing uncertainty besides significant figures. For example,

suppose a quantity is known to have a value between 20.4 and 20.0 and our best estimate of

the value is midrange at 20.2. We could write the number as 20.2 +/- 0.2 and say that the

number has a 1% uncertainty. We would also say it has 3 significant figures. If we square a

number with 1% uncertainty (i.e., 2 parts in about 200) and 3 significant figures, what

results?

a. A number with 1% uncertainty and 3 significant figures.

b. A number with 2% uncertainty and 3 significant figures.

c. A number with 2% uncertainty and 2 significant figures.

d. A number with 1% uncertainty and 2 significant figures.

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A person travelled in the -x direction at a constant speed of 2.5 m/s. The person's final position is -10.0 m, and the initial p

Nostrana [21]

Answer:

Explanation:

We have given the final position = -10 m on x axis

And the initial position =10 m

So total distance = 10-(-10)=20 m

The speed is given as 2.5 m/sec

We have tof ind the time required by the person to travel

Time is given by $t=\frac{distance}{speed}=\frac{20}{2.5}=8 sec$

So the option (c) is correct option

4 0

3 years ago

Adam drops a ball from rest from the top floor of a building at the same time Bob throws a ball horizontally from the same locat

guapka [62]

Answer:

Both balls hit the ground at the same time

Explanation:

Adam drops the ball from rest, so the ball just "<em>falls</em>" in vertical direction, being gravity its only acceleration, for cinematic movements we use that:

$y(t)=y_{0}+v_{0y}t+\frac{1}{2}gt^{2}$

In this case we have that gravity is negative, and as Adam drops the ball, $v_{0y}=0$

Bob throws the ball horizontally, so the movement will be a <em>parabola</em>, we can divide into horizontal direction, and vertical direction.

But we only need to analize the vertical movement, in wich again the only acceleration is gravity, and compare it with Adam's ball. Again we have that gravity is negative, and as the initial throw is horizontal, $v_{0y}=0$

Finally, we have that

$y(t)=h-\frac{1}{2}gt^{2}$