Why does a balloon when robbed on a wall sticks to the wall

Answers

Answer 1

Answer:

Answer:

static electricity

Explanation:

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When a star collapses to form a black hole, its mass _____.a. decreases
b. remains the same
c. increases

Answers

When a star collapses to form a black hole,its mass increases, that is letter C. One example of this is the Big BangTheory.

It is by no doubt that our universe had had its ownstarting point but how it really started became a debate for the scientistsover the past centuries. From theories such as Ekpyrotic theory, White Holes,Matrix theory, and Quantum theory, the Big Bang theory is the theory mostlyaccepted by scientists. According to the theory, the universe started as asingularity, that is, from a black hole under extreme gravitational pressureand expanded (instead of exploded) and cooled. Its cooling, according to thetheory, is still happening now as of the moment.

A bowling ball has a mass of 6 kg. What happens to its momentum when its speed increases from 2 m/s to 4 m/s? A) The initial momentum is 6 kg*m/s, and the final momentum is 3 kg*m/s
B) The initial momentum is 12 kg*m/s, and the final momentum is 24 kg*m/s
C) The initial momentum is 12 kg*m/s, and the final momentum is 3 kg*m/s
D) The inital momentum is 6 kg*m/s, and the final momentum is 12 kg*m/s

Answers

Answer:

B) The initial momentum is 12 kg*m/s, and the final momentum is 24 kg*m/s

Explanation:

The momentum of an object is given by the product between its mass (m) and its velocity (v):

$p=mv$

Let's apply this formula to calculate the initial momentum and final momentum of the ball:

- initial momentum:

$p_i = m v_i = (6 kg)(2 m/s)=12 kg m/s$

- Final momentum:

$p_f = m v_f = (6 kg)(4 m/s)=24 kg m/s$

So, the correct answer is

B) The initial momentum is 12 kg*m/s, and the final momentum is 24 kg*m/s

Momentum = (mass) x (speed)

Choice-B is the correct one.

The Earth's crustal plates move due to _____ currents.convention
condensation
convection
collaboration

Answers

Answer is C. Convection

A bicyclist in the Tour de France crests a mountain pass as he moves at 15 km/h. At the bottom, 4.2 km farther, his speed is 65 km/h. Estimate his average acceleration while riding down the mountain.

Answers

18 km/hr*1000m/km*1 hr/3600 sec= 5 m/sec

85 km/hr= 23.6 m/s

distance = 4000m

distance= initial distance+initial velocity*time+ 1/2 acceleration*time^2

initial distance=0

4000= 5.0*t+ 1/2 (accel)(time)^2

Velocity=initial velocity+ acceleration * time

23.6 m/s= 5.0 m/s+ acceleration * time

We now have two equations and two unknowns. Solve them and you have your answer.

During a baseball game, a baseball is struck at ground level by a batter. The ball leaves the baseball bat with an initial speed v0 = 38 m/s at an angle θ = 34° above horizontal. Let the origin of the Cartesian coordinate system be the ball's position the instant it leaves the bat. Air resistance may be ignored throughout this problem.

Answers

Answer:

The horizontal distance is 136.6 m.

Explanation:

Given that,

Initial speed = 38 m/s

Angle = 34°

Suppose, Calculate the horizontal distance $x_(max)$ in meters the ball has traveled when it returns to ground level.

We need to calculate the horizontal distance

Using formula of range

$R=(v_(0)^2\sin(2\theta))/(g)$

Where, v= speed

g = acceleration due to gravity

Put the value into the formula

$R=((38)^2\sin(2*34))/(9.8)$

$R=136.6\ m$

Hence, The horizontal distance is 136.6 m.

A series circuit contains two devices, one with a resistance of 10 ohms and one with a resistance of 4 ohms. If the generator supplies a voltage of 42 V, what is the magnitude of the current? A. 2 A B. 3 A C. 1.75 A D. 1.33 A

Answers

First you calculate the total resistance. Since the resistors are connected in series, the total equivalent resistance is:
Rtotal = R1 + R2 = 10 + 4 = 14 ohms

Now you calculate the electrical current with Ohm's law:
I = U/Rtotal = 42/14 = 3A

Correct answer: B. 3 A

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Krishne wants to measure the mass and volume of a thimble. Which tools should she use?

A squirrel sitting on the ground starts to run with an acceleration of 5.1 m/s 2. How fast is the squirrel going after 0.25 seconds?A. 20.4 m/s B. 1.28 m/s C. 0.49 m/s D. 3.1 m/s

Four resistors , R1=12ohms, R2= 15 ohms , R3= 18 ohms and R4=10 ohms are connected to 6 v battery in series what is the total resistance in the circuit?

Ahmad is riding his bicycle. He finds that he can accelerate from rest at 0.44 m/s^2 for 5 s to reach a speed of 2.2 m/s. The total mass of Christian and his bicycle is 54 kg. Later, he straps some cargo onto the back of his bicycle. The mass of the cargo is 12 kg.• Calculate the force that Christian can exert on his bicycle before picking up the cargo and exerts the same force on his bicycle.