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Gekata [30.6K]
3 years ago
5

Can someone help me with these questions pls

Physics
1 answer:
gogolik [260]3 years ago
7 0
8. ionic bond because lithium is a metal and oxygen is a non metal.

9. covalent bond because sulfur and oxygen are both non metals.

10. covalent

11. ionic
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Cecelia dropped a ball from a height of 2 m. The ball fell in a straight path down to the ground
trapecia [35]

The correct answer to the question is : A) Tossing it horizontally at a faster speed.

EXPLANATION:

Before going to answer this question, first we have to know the horizontal distance covered by any body when it is fired parallel to the ground.

Let us consider a body of mass m is fired with velocity u parallel to the ground. Let it was projected at a height h from the ground.

Hence, the horizontal distance covered by the projectile is calculated as -

                    Horizontal distance R = u\times \sqrt{\frac{2h}{g}}.

Here, g is known as the acceleration due to gravity.

From above, we see that more is the initial velocity, the more is the horizontal distance covered by it i.e the more is the widest curved path.

Hence, the correct answer to the question is that tossing a ball horizontally at a faster speed will trace out the widest curved path.


6 0
3 years ago
Read 2 more answers
A car starts from rest and accelerates along a straight line path in one minute it finally attains a velocity of 40 meters/secon
strojnjashka [21]
|Average acceleration| = (change in speed) / (time for the change)

Change in speed = (speed at the end) minus (speed at the beginning)

                            =        (40 m/s)            -            ( 0 )

                            =   40 m/s .

|Average acceleration| =    (40 m/s)  /  (60 sec)  =  2/3  m/s² .
6 0
3 years ago
A 10 ohm resistor has 5 a current in it. what is the voltage across the resistor?
Artemon [7]
R = 10 ohm
I = 5 A

V= IR = 10 x 5 = 50 v
3 0
3 years ago
PLEASE HELP BRAINLIEST
Leni [432]

B is the answer!!!!!!!!!!!!!

7 0
3 years ago
A mass weighing 32 pounds stretches a spring 2 feet. Determine the amplitude and period of motion if the mass is initially relea
grandymaker [24]

A mass weighing 32 pounds stretches a spring 2 feet.

(a) Determine the amplitude and period of motion if the mass is initially released from a point 1 foot above the equilibrium position with an upward velocity of 6 ft/s.

(b) How many complete cycles will the mass have completed at the end of 4 seconds?

Answer:

A = 1.803 ft

Period = \frac{\pi}{2} seconds

8 cycles

Explanation:

A mass weighing 32 pounds stretches a spring 2 feet;

it implies that the mass (m) = \frac{w}{g}

m= \frac{32}{32}

= 1 slug

Also from Hooke's Law

2 k = 32

k = \frac{32}{2}

k = 16 lb/ft

Using the function:

\frac{d^2x}{dt} = - 16x\\\frac{d^2x}{dt} + 16x =0

x(0) = -1        (because of the initial position being above the equilibrium position)

x(0) = -6          ( as a result of upward velocity)

NOW, we have:

x(t)=c_1cos4t+c_2sin4t\\x^{'}(t) = 4(-c_1sin4t+c_2cos4t)

However;

x(0) = -1 means

-1 =c_1\\c_1 = -1

x(0) =-6 also implies that:

-6 =4(c_2)\\c_2 = - \frac{6}{4}

c_2 = -\frac{3}{2}

Hence, x(t) =-cos4t-\frac{3}{2} sin 4t

A = \sqrt{C_1^2+C_2^2}

A = \sqrt{(-1)^2+(\frac{3}{2})^2 }

A=\sqrt{\frac{13}{4} }

A= \frac{1}{2}\sqrt{13}

A = 1.803 ft

Period can be calculated as follows:

= \frac{2 \pi}{4}

= \frac{\pi}{2} seconds

How many complete cycles will the mass have completed at the end of 4 seconds?

At the end of 4 seconds, we have:

x* \frac{\pi}{2} = 4 \pi

x \pi = 8 \pi

x=8 cycles

5 0
3 years ago
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