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muminat
4 years ago
6

Why did some alpha particles bounce off the gold foil?

Physics
1 answer:
Viktor [21]4 years ago
3 0
Because alpha particles are positive charged. And they bounce back because of the electromagnetic force between them and the gold foils protons.
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A 10N force is applied to a 10 kg mass for three seconds. What is the change in velocity?
qaws [65]

Answer:3m/s

Explanation:

From Newton second law of motion

Change in velocity=(force×time)/mass

Change in velocity=(10×3)/10

Change in velocity=30/10

Change in velocity=3m/s

5 0
3 years ago
Suppose you ride a bicycle and exert a force of 1000J, but the bicycle's output force is 200J. What is the efficiency of the bic
lorasvet [3.4K]
The efficiency of the bicycle is 20% because 200 out 100 is 2.and ,convert 1000 j out 100 that equal to 10 but,then multiply 2×10 that equal to 20%
8 0
4 years ago
An object is projected straight upward with an initial speed of 25.0 m/s. What's the maximum height obtained by the object ?
Debora [2.8K]

Answer:

The maximum height obtained by the object is approximately 31.855 m

Explanation:

The vertical velocity of the object = 25.0 m/s

The height reached by the object, is given by the following formula;

v² = u²  -  2 × g × h

Where;

u = The initial velocity of the object = 25.0 m/s

v = The final speed of the object = 0 m/s at maximum height

h = The maximum height obtained by the object

g = The acceleration due to gravity = 9.81 m/s²

Substituting the values, gives;

0² = (25.0 m/s)²  -  2 × 9.81 m/s² × h

2 × 9.81 m/s² × h = (25.0 m/s)²

h = (25.0 m/s)²/(2 × 9.81 m/s²) ≈ 31.855 m

The maximum height obtained by the object, h ≈ 31.855 m.

5 0
3 years ago
Describe three physical changes that occur in nature?
Alex Ar [27]

Answer: Physical changes in nature could then be erosion in a mountain, the melting of snow, and a river freezing over from the cold. Since none of these changes affect the chemical composition of the mountain, the snow, or the river, they are physical changes.

Explanation:

8 0
3 years ago
Read 2 more answers
A tourist stands at the top of the Grand Canyon, holding a rock, overlooking the valley below. Find the final velocity, and disp
uranmaximum [27]

Answer:

a. Vf = 39.24 [m/s]

b. Vf = 31.24 [m/s]

c. Vf = 47.24 [m/s].

Explanation:

To solve this problem we can use the following equation of kinematics. We have to keep in mind that the gravitational acceleration acts downwards, therefore when the rock falls towards the abyss it has the same direction of the acceleration and that is why the gravitational acceleration has a positive sign in the equation.

v_{f}=v_{o}+g*t

where:

Vf = final velocity [m/s]

Vo = initial velocity = 0 (when the rock is dropped)

g = gravitational acceleration = 9.81 [m/s²]

t = time = 4 [s]

a.

v_{f}=0+9.81*4\\v_{f}= 39.24 [m/s]

b.

In this particular situation, the acceleration will be taken as negative because the gravity is pointing in the opposite direction of the movement of the rock.

v_{f}=8-(9.81*4)\\v_{f}=-31.24[m/s]

The negative sign in the answer tells us that the rock no longer moves up instead it does downwards when 4 seconds have passed.

c.

v_{f}=8+(9.81*4)\\v_{f}=47.24[m/s]

4 0
3 years ago
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