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3 years ago

8

By using electroscope, if the body is negatively charged then due to electrostatic induction, then on the leaves there will be a

ppear:
(a) both positive and negative charges
(b) negative charge
(c) positive charge
(d) no charge

2 answers:

Kryger [21]3 years ago

6 0

(b) negative charge

This is the answer

Gnom [1K]3 years ago

5 0

It should be

B)Negative charge

Hope this one helped

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A footballer kicks a ball at angle teta to horizontal with some initial velocity a) what are the two types of independent motion

Nezavi [6.7K]

a) The motion along the vertical direction and the motion along the horizontal direction.

b) The object remains in the air for a time period of 2usin(θ)/g.

Any object that is thrown in the air when gravity is acting on it is called a projectile. The motion of this projectile is called projectile motion.

When the projectile is thrown in the air at some angle θ, then there are two independent motions taking place at the same time. First is the component of motion along the vertical direction along which gravity acts. Second is the component of motion along the horizontal direction along which the object moves with a constant velocity. No force acts along the horizontal direction. The horizontal motion does not affect the vertical motion and the converse is also true. So these are independent of each other.

The time of flight is the time during which a projectile remains in the air. This time of flight is calculated using the formula,

T=2usin(θ)/g

where T is the time of flight, u is the initial velocity and g is the acceleration due to gravity.

Hence, the object remains in the air for a time period of 2usin(θ)/g.

Learn more about projectile.

brainly.com/question/11049671

#SPJ4

8 0

2 years ago

A positive charge is placed within the sphere without touching it. You grounded the sphere by touching it with your finger. Then

zhuklara [117]

Answer:

Negative

Explanation:

If a negatively charged object is used to charge a neutral object by induction, then the neutral object will acquire a positive charge. And if a positively charged object is used to charge a neutral object by induction, then the neutral object will acquire a negative charge:

We have a neutral sphere

1) Electrons are attracted to the positive charge

2) Electrons enter the sphere from ground, attrated to the + charge in the sphere

3) The sphere has an excess of e- having entered from the ground

4) Electrons redistribute uniformly

3 0

4 years ago

While skateboarding at 19 km/h throwning a tennis ball at 11 km/h what is the speed of the ball

Lina20 [59]

According to whom ?

So YOU're on your skateboard, and there's somebody else, sitting on HIS porch, watching you skate by on your board.

-- The man on the porch says you're skating by him at 19 km/hr .

-- You throw a tennis ball.

. . . . . Do you throw it in the same direction that you're skateboarding, or do you throw it away behind you, toward the place you just came from ?

. . . . . Does it fly away from YOU at 11 km/hr ? Or does it fly past the man on the porch at 11 km/hr ?

There are 4 possible combinations. One of them is not possible. Each of the other three combinations leads to two different answers to the question. And ALL six answers are correct !

1). You throw the ball forward, in the same direction you're skating. It flies away from your hand at 11 km/hr.

To you, the speed of the ball is 11 km/hr, in the direction you're skating. To the man on the porch, it's 30 km/hr, in the direction you're skating.

2). You throw the ball forward, in the same direction you're skating. It flies past the porch at 11 km/hr.

This isn't possible.

3). You throw the ball backward, toward where you just came from. It flies away from YOU at 11 km/hr.

To you, the speed of the ball is 11 km/hr, in the direction backward from you. To the man on the porch, the speed of the ball is 10 km/hr in the direction you're skating.

4). You throw the ball backward, toward where you just came from. It flies past the porch at 11 km/hr.

To you, the speed of the ball is 8 km/hr, in the direction backward from you. To the man on the porch, it's 11 km/hr in the direction you're skating.

NOW you're going to ask me "But what's the REAL speed of the ball ?"

The answer to THAT one is: There's no such thing ! It all depends on WHO's measuring it ... where that observer is and how HE's moving.

The displacement, speed, velocity, acceleration, and energy of the ball, ALL depend on who's watching it and measuring it.

I'll be interested to see whether you mark this answer 'Brainliest', or report it because it's weird, confusing, and ridiculous.

3 0

4 years ago

A"boat"is"moving"to"the"right"at"5"m/s"with"respect"to"the"water."A"wave"moving"to"the"left,"opposite"the"motion"of"the"boat."Th

s2008m [1.1K]

Answer:

0.99m

Explanation:

Firs you calculate the relative velocity between the boat and the wave. The velocity of the boat is 5m/s and the velocity of the wave is given by:

$v=\lambda f=\lambda\frac{1}{T}=(110m)\frac{1}{8.3s}=13.25\frac{m}{s}$

the relative velocity is:

$v'=13.25m/s-5m/s=8.25\frac{m}{s}$

This velocity is used to know which is the distance traveled by the boat after 20 seconds:

$x'=v't=(8.25m/s)(20s)=165m$

Next, you use the general for of a wave:

$f(x,t)=Acos(kx-\omega t)=Acos(\frac{2\pi}{\lambda}x-\omega t)$

you take the amplitude as 2.0/2 = 1.0m.

$\omega=\frac{2\pi}{T}=\frac{2\pi}{8.3s}=0.75\frac{rad}{s}$

by replacing the values of the parameters in f(x,t) you obtain the vertical displacement of the boat:

$f(165,20)=1.0m\ cos(\frac{2\pi}{110m}(165)-(0.75\frac{rad}{s})(20s))\\\\f(165,20)=0.99m$

6 0

4 years ago

Urgent help for a physics exercise!

Zigmanuir [339]

a)

Amplitude of wave is given as maximum displacement from mean position

So here amplitude is 1.25 cm

b)

Wavelength is the length of the wave that it travels in one time period

From graph we can say the wavelength is given as 3cm

PART C)

Time period of wave is the time after which it repeats its shape

Speed of the wave = 21 cm/s

time period = wavelength / speed

$T = \frac{3}{21}$

$T = \frac{1}{7} s$

Now frequency is

$f = \frac{1}{T}$

$f = 7 Hz$

PART D)

Time period = \frac{1}{f}[/tex]

$T = 0.143 s$

6 0

4 years ago