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4 years ago

14

How does science help society?

2 answers:

Arada [10]4 years ago

8 0

Learn and create new things. It also builds our economy

Ber [7]4 years ago

3 0

It helps us learn more about the world around us

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Shania says that the fulcrum is part of the lever and Ali says that the pivot is part of a lever. who is correct?

suter [353]

Answer:

Shania is correct because a fulcrum is the lower part of a lever and a pivot is not part.

Explanation:

5 0

3 years ago

Read 2 more answers

What is the weight of a 45 kg box?

8_murik_8 [283]

45 kg.Hope it helps! :)

4 0

3 years ago

Read 2 more answers

If the vector below is multiplied by 2, what will be its end point?

seropon [69]

The end point would be (4,-1).

<u>Explanation:</u>

When you multiply a vector with a scalar, it is known as a scalar multiplication. This multiplication is as simple as multiplying each component of the vector by the scalar because scalar is just another way to call a real number. The result of this multiplication is always a vector.

Multiplying a positive scalar larger than one will increase the magnitude of the vector, but not it's direction. A positive scalar smaller than one will decrease the magnitude. And negative scalar will reverse the direction and increase or decrease the magnitude depending on whether scalar is more than one or less than one.

6 0

3 years ago

Fiona and her twin sister April are enjoying the bumper cars at an amusement park. Fiona drives her car toward her sisters and t

vlabodo [156]

The mass of April and her bumper car is 80 kg

Explanation:

This problem can be solved by using the law of conservation of momentum.

In fact, the total momentum of the system must be conserved before and after the collision, so we have:

$p_i = p_f\\m_1 u_1 + m_2 u_2 = m_1 v_1 + m_2 v_2$

where:

$m_1 = 80 kg$ is the mass of Fiona+her bumper

$u_1 = 3 m/s$ is the initial velocity of Fiona (we take her direction as positive direction)

$v_1 = -1 m/s$ is the final velocity of Fiona (she rebounds back)

$m_2$ is the mass of April+her bumper

$u_2 = - 1 m/s$ is the initial velocity of April (in the opposite direction)

$v_2 = 3 m/s$ is the final velocity of April

Re-arranging the equation, we can find the mass of April+bumper:

$m_2 = \frac{m_1 u_1 - m_1 v_1}{v_2-u_2}=\frac{(80)(3)-(80)(-1)}{3-(-1)}=80 kg$

Learn more about momentum here:

brainly.com/question/7973509

brainly.com/question/6573742

brainly.com/question/2370982

brainly.com/question/9484203

#LearnwithBrainly

5 0

3 years ago

An engineer is designing a spring to be placed at the bottom of an elevator shaft. If the elevator cable should happen to break

Anuta_ua [19.1K]

Answer:

$k = 9876 N/m$

Explanation:

As per energy conservation we know that

initial total gravitational potential energy = final spring potential energy

so we have

$mg(h + x) = \frac{1}{2}kx^2$

also we know that maximum acceleration will be 5.3 g

so it is given as

$a = \frac{k}{m} x$

so we have

$x = \frac{ma}{k} = \frac{5.3 mg}{k}$

$mg(h + \frac{5.3 mg}{k}) = \frac{1}{2}k(\frac{5.3mg}{k})^2$

$mg(h + \frac{5.3 mg}{k}) = \frac{14.045(mg)^2}{k}$

$h + \frac{5.3mg}{k} = \frac{14.045 mg}{k}$

$h = \frac{8.745mg}{k}$

$k = \frac{8.745 (1439)(9.81)}{12.5}$

$k = 9876 N/m$

6 0

3 years ago