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3 years ago

How does temperature increase?

2 answers:

6 0

Increasing the temperature increases reaction rates because of the disproportionately increase in the number of high energy collisions.
It's only these collisions (possessing at least the activation energy for the reaction)
which results in a reaction!

Lemur [1.5K]3 years ago

4 0

Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction.

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Janetta ran a campaign for student body president, and she really wanted to win. She gave election buttons to everyone and told

SVEN [57.7K]

Answer:

No, because she is hoping that people will vote for her.

Explanation:

Altruism is when you do something for others and have very little expectation of getting something in return. In this case, Janetta expected something in return from her friends. We may not also be sure of the sincerity of Janetta appreciating friendship. From the above definition of altruism, we conclude that Janetta's actions are not altruistic because she hoped that people will vote for her.

3 0

3 years ago

A compact car has a maximum acceleration of 2.0 m/s2 when it carries only the driver and has a total mass of 1100 kg . you may w

nadya68 [22]

According to Newton`s law. Force exerted by car,

$F = m a = 1100 kg \times 2 m/s^2 = 2200 \ N$

After adding an additional 400 kg of mass, the force will be same therefore the acceleration

$F = 2200 \ N = (1100 \ kg + 400 \ kg) a \\\\ a = \frac{2200 \ N}{1500 \ kg} = 1.47 \ m/s^2$

Thus, the acceleration after adding the masses is 1.47 \ m/s^2.

4 0

3 years ago

An artillery shell of mass 30 kg has a velocity of 250 m/s vertically upward. The shell explodes into two pieces; immediately af

olga_2 [115]

Answer:

9654.34 m

Explanation:

from conservation of momentum

$\begin{aligned}30 \times 250 &=-10 \times 120+20 \times V \\20 V &=30 \times 250+10 * 120 \\V &=\frac{30 \times 250+10 \times 120}{20}=435 \mathrm{~m} / \mathrm{s}\end{aligned}$

And from Conservation of Energy

$\frac{1}{2} m v^{2}=m g h\\h=\frac{v^{2}}{2 g}\\h=\frac{(435(m/s))^{2}}{2 \times 9.8(m/s^{2} )}\\h=9654.34 (m)$

7 0

2 years ago

In an orbiting space shuttle, you are handed two identical boxes, one filled with sand and the other filled with feathers. How c

Aleks04 [339]

Explanation:

Simply, shake the boxes. The box that is difficult to shake will be the sand and the box that will be easier will be the feathers.

3 0

3 years ago

(1) A hydraulic press is used to lift heavy objects. It consists of a U-tube, one end having a large cross-sectional area A1, th

lana [24]

Answer:

The load that can be lifted is equal to the weight W = F2A1/A2

Explanation:

According to Pascal principle which states that the pressure applied to a liquid confined in a container will be transmitted equally to all other parts of the container.

Since pressure = Force/Area

The force F2 applied at one end of the piston will generate a pressure of F2/A2. This pressure generated will be transmitted to the other end of the piston of area A1 to lift the load through a distance.

The piston where the load is will experience an upward force F1 which is equal to Pressure × Area.

The pressure experienced by the load is applied by force F2.

Force on the load = (Pressure exerted by Force F2) × Area at the larger end A1

Force on the load = F2/A2 × A1

Since the load experiences a weight W

The weight will be equal to the force on the load which is to be lifted i.e W =Force on the load.

W = F2A1/A2

The load that can be lifted is equal to the weight W = F2A1/A2

6 0

3 years ago