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lisabon 2012 [21]

4 years ago

10

When a force is applied to an object for an amount of time, it is known as __________.

2 answers:

timama [110]4 years ago

4 0

<span>When a force is applied to an object for an amount of time, it is known as Impulse.</span>

Shalnov [3]4 years ago

3 0

I believe the answer is impulse... Please correct me if wrong! By the way are you a k12 student? I am.. Are you in 6th grade? I had to take this test also today!

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Which of the following is true regarding momentum?

kakasveta [241]

Increasing the mass of an object increases its momentum.

Explanation:

Momentum of an object is measured as the quantity of motion done by the object.
It is calculated using the formula, p = m × v where m is mass of the object and v is the velocity of the object.
As momentum and mass vary proportionally, as seen in the formula, increasing the mass of an object will also increase its momentum.

8 0

3 years ago

The following question has two parts. First, answer part A. Then, answer part B.

Agata [3.3K]

Answer:

for part A the answer is D and for part B the answer is F

5 0

3 years ago

Does resistance in a circuit remain constant if the temperature changes?

Mazyrski [523]

Answer:

No the resistance of a given circuit does not remain constant if the temperature of the circuit changes.

Explanation:

The resistance of any resistor used in a circuit depends upon the temperature of that resistor. This can be mathematically represented as follows

$R(t)=R_{0}(1+\alpha \Delta t)$

Where,

R(t) is resistance of any resistor at temperature t

$R_{o}$ is the resistance of the resistor at time of fabrication

α is temperature coefficient of resistivity it's value is different for different materials

This change in the resistance is the cumulative effect of:

1) Variation of resistivity with temperature

2) Change in dimensions of the resistor with change in temperature

6 0

4 years ago

2. If you want to increase the pressure, you should increase the area over which the force operates. True False

Elena L [17]

False, you'd have less pressure if you increased the area.

P=F/A, you're dividing by A. If you say, doubled A, you'd have only half the pressure.

5 0

3 years ago

Read 2 more answers

The center of mass of a cow and the center of mass of a tractor are 208 meters apart. The magnitude of the gravitational force o

hjlf

Answer:

$4.5\times 10^{-10}\ N$

Explanation:

The gravitational force between two masses is inversely proportional to the square of the distance between them such that,

$\dfrac{F_1}{F_2}=\dfrac{r_2^2}{r_1^2}$ .....(1)

We have,

r₁ = 208 m, $F_1=1.8\times 10^{-9}\ N$ , r₂ = 416 m, F₂ = ?

Put all the values in relation (1) such that,

$F_2=\dfrac{F_1r_1^2}{r_2^2}\\\\F_2=\dfrac{1.8\times 10^{-9}\times 208^2}{416^2}\\\\F_2=4.5\times 10^{-10}\ N$

So, the required force is $4.5\times 10^{-10}\ N$ . Hence, the correct option is (d).

7 0

3 years ago