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Flura [38]
3 years ago
10

Show work and we

Physics
1 answer:
larisa [96]3 years ago
8 0
Acceleration = final velocity - initial velocity/time taken
A = Vf-Vi/t
A = 1 m/s - 0 m/s / 4 sec
A = 1 m/s / 4 sec
A = 0.25 m/s2
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n 38 g rifle bullet traveling at 410 m/s buries itself in a 4.2 kg pendulum hanging on a 2.8 m long string, which makes the pend
Kitty [74]

Answer:

68cm

Explanation:

You can solve this problem by using the momentum conservation and energy conservation. By using the conservation of the momentum you get

p_f=p_i\\mv_1+Mv_2=(m+M)v

m: mass of the bullet

M: mass of the pendulum

v1: velocity of the bullet = 410m/s

v2: velocity of the pendulum =0m/s

v: velocity of both bullet ad pendulum joint

By replacing you can find v:

(0.038kg)(410m/s)+0=(0.038kg+4.2kg)v\\\\v=3.67\frac{m}{s}

this value of v is used as the velocity of the total kinetic energy of the block of pendulum and bullet. This energy equals the potential energy for the maximum height reached by the block:

E_{fp}=E_{ki}\\\\(m+M)gh=\frac{1}{2}mv^2

g: 9.8/s^2

h: height

By doing h the subject of the equation and replacing you obtain:

(0.038kg+4.2kg)(9.8m/s^2)h=\frac{1}{2}(0.038kg+4.2kg)(3.67m/s)^2\\\\h=0.68m

hence, the heigth is 68cm

4 0
3 years ago
Heat energy is produced when molecules move. True False
Dennis_Churaev [7]

Answer:

true

Explanation:

7 0
3 years ago
What is the gravitational force on a 35.0 kg object standing on the Earth's surface?
kari74 [83]
F=mg
F=35*9.81
F=343.35N
4 0
3 years ago
Why do we learn useless nonsense school, why don't we learn what we will actually use in life
laila [671]
I totally agree but, in my opinion its because of the government and what the state has control over. Teacher have little control over it.
4 0
3 years ago
In September 2016 you purchased a 125 shares of Grainger stock for $224.84. It is now September 2019 and Grainger stock is curre
Temka [501]

Answer:

Gain in capital = $ 70.72

Explanation:

Given:

- The price of stocks when purchased P_o = $ 224.84

- The price of stocks when sold P_s = $ 295.56

Find:

what would be your capital gain (loss) on the sale, ignoring commissions

Solution:

- The capital gain or loss on the selling of stocks stems from the difference of buying and selling value of stocks. The original price of stock was P_o and the selling price would be P_s. The difference would be:

                             capital gain = P_s - P_o

                             capital gain =  $295.56 - $224.84

                             capital gain = $ 70.72

- Hence, there would be a gain in capital if sold today for about $ 70.72.

6 0
3 years ago
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