1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Fed [463]
3 years ago
15

A scientist is giving a demonstration with a Van de Graaff generator in a class about electrostatics. The scientist can detect t

he type of charge on the Van de Graaff generator by ____________________________________________.
A) bringing a positively charged balloon near it.
B) seeing if it picks up bits of paper from a surface.
C) touching it with a metallic rod that conducts charge.
D) testing if it attracts a neutral sphere made of plastic.
Physics
2 answers:
DanielleElmas [232]3 years ago
7 0
I believe the answer is A) bringing a positively charged balloon near it.
Natali5045456 [20]3 years ago
6 0

Answer:

A) bringing a positively charged balloon near it.

Explanation:

This is the correct answer because is the only option in which the object has a charge (a positive one in this case). That means when the scientist brings a positively charged balloon near the hollow metal globe on the top of the Van de Graaff generator a repulsion is seen it because the globe is positively charged too.

You might be interested in
A cord of mass 0.65 kg is stretched between two supports 28 m apart. if the tension in the cord is 150 n, 2 how long will it tak
MaRussiya [10]
Ans: Time <span>taken by a pulse to travel from one support to the other = 0.348s
</span>
Explanation:
First you need to find out the speed of the wave.

Since
Speed = v = \sqrt{ \frac{T}{\mu} }

Where
T = Tension in the cord = 150N
μ = Mass per unit length = mass/Length = 0.65/28 = 0.0232 kg/m

So
v = \sqrt{ \frac{150}{0.0232} } = 80.41 m/s

Now the time-taken by the wave = t = Length/speed = 28/80.41=0.348s
5 0
3 years ago
In an HVAC system, the purpose of pneumatics is to serve as A. a controller B. conditional air flow C. an energy source D. a sou
Naya [18.7K]

Answer: <u><em>A</em></u>

Explanation:

A pneumatic control system uses compressed air as a method of control for HVAC systems. ... Each senor responds to changes in temperature, humidity, and static pressure as examples, to provide feedback in a control loop to open or close the actuator to meet the control set point.

3 0
3 years ago
Which measurements are equal to 321 decimeters
vlabodo [156]
You are currently converting Distance and Length units from Centimeters to Feet 321 Centimeters (cm) = 10.5315 Feet (ft) This is a hard one but see if this helps if not let me now and i can try again..
7 0
3 years ago
Explain Newton's first law of motion for an object in<br> motion.
Anit [1.1K]

Answer:

bshghhxhgdyxhsygfhtgedhrugrugdjifgu

rolling of a ball uses motion his bushy we I his own shaken his known fish of his jus on

6 0
2 years ago
A rock falls off a 15 meter cliff. How fast is the rock traveling vertically two seconds later?
oksian1 [2.3K]
The acceleration of gravity on Earth is 9.8 m/s².  That means that
an object falling under the influence of gravity will move 9.8 m/s
faster than it was moving a second earlier.

Falling from rest, it will be moving 9.8 m/s after the first second,
and 19.6 m/s after the 2nd second.

The height from which it fell doesn't matter.
8 0
3 years ago
Other questions:
  • Which involves more work in the scientific sense: moving the boxes and the furniture down from the second floor or up to the fif
    6·1 answer
  • What is the total energy of a particle with a rest mass of 1 gram moving with half the speed of light? 1 eV = 1.6 x 10^-19 J. An
    14·1 answer
  • A ball was dropped from a height of 10 feet. Each time it hits the ground, it bounces 4/5 of its previous height. Find the total
    9·1 answer
  • A basketball player standing under the hoop shoots the ball straight up with an initial velocity of v0Part (a) What is the maxim
    8·1 answer
  • Two stones are launched from the top of a tall building. One stoneis thrown in a direction 30.0^\circ above the horizontal with
    6·1 answer
  • What happens to a star after it goes supernova? Does the remnant of the star form a dwarf star, neutron star, black hole, or som
    8·2 answers
  • 50 points!!! Kinetics
    14·2 answers
  • How can a heat pump warm a house by causing a refrigerant to evaporate and condense
    14·1 answer
  • A student is on a balcony 15.6 m above the street. She throws a ball vertically downward at 10.7 m/s.
    13·1 answer
  • What is an example of situational irony in the excerpt?​
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!