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lukranit [14]
4 years ago
15

Which situation describes a non-contact force changing the speed of an object?(1 point)

Physics
1 answer:
SashulF [63]4 years ago
5 0
A ball accelerating as it rolls down a hill
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A proton (mass m 1.67 x 1027 kg) is being accelerated along a straight line at 1.4 x 1015 m/s2 in a machine. The proton has an i
BaLLatris [955]

Answer:

Part a)

v_f = 2.569 \times 10^7 m/s

Part b)

\Delta K = 7.014 \times 10^{-14} J

Explanation:

Part a)

As we know that proton is accelerated uniformly so we can use kinematics here to find the final speed

so we know that

v_i = 2.4 \times 10^7 m/s

d = 3 cm

a = 1.4 \times 10^{15} m/s^2

so we will have

v_f^2 - v_i^2 = 2 a d

v_f^2 - (2.4 \times 10^7)^2 = 2(1.4 \times 10^{15})(0.03)

v_f^2 = 6.6 \times 10^{14}

v_f = 2.569 \times 10^7 m/s

Part b)

Now increase in kinetic energy is given as

\Delta K = \frac{1}{2}m(v_f^2 - v_i^2)

\Delta K = \frac{1}{2}(1.67 \times 10^{-27})[(2.569 \times 10^7)^2 - (2.4 \times 10^7)^2]

\Delta K = 7.014 \times 10^{-14} J

7 0
3 years ago
I need help setting this problem up. Please help! A mother pushes a stroller up a hill, with the center of the stroller 1 meter
White raven [17]

The only thing you can derive ...maybe ... from the given information is that
the stroller's x(t) is 1 + the mother's x(t).  And if her progress is not strictly
along the x-axis, then even <em>that</em> statement isn't true.

If the stroller's v(t) and a(t) were not identical to the mother's v(t)and a(t), then
mother and stroller would "come apart".  But you've told us that they're always
in contact, so their v(t) and a(t) must be identical.

A slightly more rigorous (and mathematical) argument is that since the mother's
and the stroller's x(t) differ (at most) only by a constant, then their derivatives
x'(t) (which is v(t)) and x''(t) (which is a(t)) are equal.

4 0
3 years ago
The strength of gravitational force is dependent on the masses of and distance between two objects.
rodikova [14]

Truer words are seldom written.

7 0
4 years ago
Will mark ask brainlest
kvv77 [185]

Answer:

woah yes

Explanation:

5 0
3 years ago
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. What type of stress is tension and at what type of plate boundary is it found?
Mrac [35]
The three main types of stress go along with the three types of plate boundaries: compression is common at convergent boundaries, tension at divergent boundaries, and shear at transform boundaries. Hope this helps
7 0
3 years ago
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