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3 years ago

Need help with number 6 and 7 please

Physics

1 answer:

elena-14-01-66 [18.8K]3 years ago

4 0

358 rocks, critical thinking

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A 1.8-kg object moves in the x direction according to the following function:

DanielleElmas [232]

Well, if the position is  x(t) = 2t² + 3t - 5

then the speed is x ' (t) = 4t + 3 (first derivative of 'x' wrt 't')

and the acceleration is x ' ' (t) = 4 (second derivative of 'x' wrt 't')

Apparently, then, the acceleration is constant, and is not a function of time.

After 2.7 seconds or 2.7 years, the acceleration is 4 .

Force = (mass) x (acceleration)

Force = (1.8) x (4)

Force = 7.2 newtons 

8 0

3 years ago

UPVOTES FOR EVERY ANSWER!!!!!!!!

Goshia [24]

A. The magnetic force increases.

F is inversely proportional to r²

Hope this helps!

7 0

3 years ago

Read 2 more answers

A certain field line diagram illustrates the electric field due to three particles that carry charges 5.0 μC, -3.0 μC, and -2.0

4vir4ik [10]

Answer:

Explanation:

Number of lines emanate from + 5 micro coulomb is 15 .

They terminates at negative charges that means at - 3 micro coulomb and - 2 micro Coulomb.

the electric field lines terminates at - 3 micro Coulomb and - 2 micro Coulomb is in the ratio of 3 : 2.

So the lines terminating at - 3 micro coulomb

= $\frac{3}{5}\times 15 = 9$

So the lines terminating at - 2 micro coulomb

= $\frac{2}{5}\times 15 = 6$

So, the number of filed lines terminates at - 2 micro Coulomb are 6.

4 0

3 years ago

A plane can fly 390 miles in the same time as it takes a car to go 120 miles. If the car travels 90 mph slower than the plane, f

never [62]

thats a hella slow plane

3 0

3 years ago

A 70.0-kg person throws a 0.0420-kg snowball forward with a ground speed of 35.0 m/s. A second person, with a mass of 57.0 kg, c

ollegr [7]

Answer:

so throwers new velocity = 2.18032m/s

so catchers new velocity = 0.02577m/s

Explanation:

Directly by conservation of momentum we can write

$m_1u_1+m_2u_2= m_1v_1+m_2v_2$

let x be the thrower's new velocity

(70+0.042)×2.2 + 57×0 = 70× x +0.042×35 +57×0

x = 2.18032m/s

so the velocity of 70 kg man = 2.18032m/s

so throwers new velocity = 2.18032m/s

now again by conservation of momentum

0.042×35 = (57+0.042) ×y

y = 0.02577m/s

so catchers new velocity = 0.02577m/s

3 0

3 years ago