PHYSICS HIGH SCHOOL

According to this equation, F=ma, how much force is needed to accelerate a 70-kg runner at 5m/s2?A.
350 m/s

B.
14 N

C.
350 N

D.
14 m/s

Answers

Answer 1
Answer: F=ma = 70*5 = 350N, therefore, 350N is needed to accelerate a 70-kg runner at 5m/s2.

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If sediment is pushed along the underside of a glacier, what would occur?

Answers

When sediment is pushed along the underside of the glacier, striations occur. Striations are "Scratches" that look like long, parallel grooves. This also shows the direction that the glacier has moved in. Sediment gets pushed along the underside due to the flowing of the glacier.

Answer:

Glacial Striations

Explanation:

Glacier is an erosion agent that transports and deposits sediments.

Due to the weight and gradual flow of a glacier, it carves along parts of the mass beneath it, these parts are known as sediments, this movement causes marks to appear on the land beneath it. These marks are called Glacial Striations.  

Please help me! Ill give brainliest who helps me first!!!!What is one difference between mixtures and pure substances?
A. mixtures can be physically separated
B. mixtures are made of one type of atom
C. pure substances have no chemical bonds
D. pure substances can be physically separated

Answers

i think it’s A hope this helps
Mixtures can be physically separated (I believe)

The equation for the chemical reaction shown is not balanced. What number should replace the question mark to balance this equation?2KBr + ?Pb(NO3)2 → 2KNO3+ PbBr2

A.
The equation is balanced as is.

B.
A 6 is required.

C.
A 3 is required.

D.
A 2 is required.

Answers

The equation is balanced as it is.

A friend tosses a baseball out of his second floor window with initial velocity of 4.3m/s(42degrees below the horizontal). The ball starts from a height of 3.9m and you catch the ball 1.4m above the ground.a) Calc the time the ball is in the air (ans. 0.48s)
b)Determine your horisontal distance from window (ans. 1.5 m)
c)Calc the speed of ball as you catch it (ans: 8.2m/s)

I dont get what 42 m below the horizontal is, can someone give me direction on how to do this?

Answers

Answer:

Part a)

t = 0.48 s

Part b)

x = 1.5 m

Part c)

v = 8.23 m/s

Explanation:

As we know that the velocity of ball is

v = 4.3 m/s

now the two components of velocity is given as

v_x = 4.3 cos42 = 3.19 m/s

v_y = 4.3 sin42 = 2.88 m/s

Part a)

now in Y direction we will have

y = y_o + v_y t + (1)/(2)gt^2

1.4 = 3.9 - 2.88 t - 4.9 t^2

so we have

t = 0.48 s

Part b)

Now the distance covered by the ball in horizontal direction is given as

x = v_x t

x = 3.19 * 0.48

x = 1.5 m

Part c)

speed in x direction will always remain the same

so we have

v_x = 3.19 m/s

speed in y direction is given as

v_y = v_i + at

v_y = 2.88 + (9.8)(0.48)

v_y = 7.58 m/s

So final speed will be

v = √(v_x^2 + v_y^2)

v = 8.23 m/s

When an oxygen atom forms an ion, it gains two electrons. What is the electrical charge of the oxygen ion? A. +2 B. -1 C. -2 D. +1

Answers

C. 2-

electrons have a negative charge, thus adding two electrons to an atom will give it a charge of 2 times -1 or -2

let me correct you , You miss typed "2-" its actually "-2"

In the Bohr model of the hydrogen atom, an electron moves in a circular path around a proton. The speed of the electron is approximately 2.20 3 106 m/s. Find (a) the force acting on the electron as it revolves in a circular orbit of radius 0.529 3 10210 m and (b) the centripetal acceleration of the electron

Answers

The force of a particle moving in a circular motion is:
F=ma
where m is the mass and a is the centripetal acceleration, which is expressed as:
a=v²/r

where v is the speed and r the distance between the particles. You use these equations, by substituting the values given in order to solve  the problem.
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