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wolverine [178]
3 years ago
13

Why do you experience a shock or even see a spark when you reach for a doorknob.

Physics
2 answers:
Verizon [17]3 years ago
4 0

Answer: static electricity

Explanation:

You see, you rubbed your body either against a coat or the carpet. It send negative electrons throughout your body and once you hit metal with your hand it creates an electric shock that’s called static electricity.

tresset_1 [31]3 years ago
3 0
When you touch a doorknob, all the charge wants to leave you and go to the doorknob. You see a spark and get a shock as the electrons leave you. Lightning is the result of static electricity.
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An early submersible craft for deep-sea exploration was raised and lowered by a cable from a ship. When the craft was stationary
rusak2 [61]

Answer:

a) 5200 N  b) 8800 N

Explanation:

a) tension in the cable when it was being lowered to the sea floor = weight of the object which acts downward ( equals the tension in the cable when the craft was stationary in opposite direction)  - the drag force which will act upward =  7000 - 1800 = 5200 N

b) tension in the cable when the craft was being raised since the tension will act upward and the drag force and the weight will act downward = 7000 + 1800 = 8800 N

6 0
3 years ago
Who was the first person to walk on the moon ?
liq [111]

Answer:

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Explanation:

8 0
3 years ago
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Which of the following describes how the mechanical advantage of a simple machine affects the amount of force needed for work? A
Simora [160]

Answer:

The answer is a

Explanation:

5 0
3 years ago
A block of mass m1 = 3.5 kg moves with velocity v1 = 6.3 m/s on a frictionless surface. it collides with block of mass m2 = 1.7
maxonik [38]
First, let's find the speed v_i of the two blocks m1 and m2 sticked together after the collision.
We can use the conservation of momentum to solve this part. Initially, block 2 is stationary, so only block 1 has momentum different from zero, and it is:
p_i = m_1 v_1
After the collision, the two blocks stick together and so now they have mass m_1 +m_2 and they are moving with speed v_i:
p_f = (m_1 + m_2)v_i
For conservation of momentum
p_i=p_f
So we can write
m_1 v_1 = (m_1 +m_2)v_i
From which we find
v_i =  \frac{m_1 v_1}{m_1+m_2}= \frac{(3.5 kg)(6.3 m/s)}{3.5 kg+1.7 kg}=4.2 m/s

The two blocks enter the rough path with this velocity, then they are decelerated because of the frictional force \mu (m_1+m_2)g. The work done by the frictional force to stop the two blocks is
\mu (m_1+m_2)g  d
where d is the distance covered by the two blocks before stopping.
The initial kinetic energy of the two blocks together, just before entering the rough path, is
\frac{1}{2} (m_1+m_2)v_i^2
When the two blocks stop, all this kinetic energy is lost, because their velocity becomes zero; for the work-energy theorem, the loss in kinetic energy must be equal to the work done by the frictional force:
\frac{1}{2} (m_1+m_2)v_i^2 =\mu (m_1+m_2)g  d
From which we can find the value of the coefficient of kinetic friction:
\mu =  \frac{v_i^2}{2gd}= \frac{(4.2 m/s)^2}{2(9.81 m/s^2)(1.85 m)}=0.49
3 0
3 years ago
It dont have the subject science so it science
WINSTONCH [101]

Answer:

The human activity that uses the most water worldwide is for agriculture. In other words, watering crops.

Explanation:

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7 0
2 years ago
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