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Julli [10]
2 years ago
13

Một mẫu vật liệu có khối lượng riêng là 2500kg/m3

Physics
1 answer:
Leokris [45]2 years ago
6 0

Explanation:

khoâng cách MO làkhoâng cách MO làkhoâng cách MO làkhoâng cách MO làkhoâng cách MO làkhoâng cách MO làkhoâng cách MO làkhoâng cách MO làkhoâng cách MO làkhoâng cách MO làkhoâng cách MO làkhoâng cách MO là

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A ball is thrown horizontally from the top of a building 37.5 m high. The ball strikes the ground at a point 80.3 m from the bas
trasher [3.6K]

Answer:

t = 2.77 s

Explanation:

The ball in its movement describes a curved line called a semiparabola, therefore two coordinates are required to fix the position at each instant of time, since the movement is performed in the X-Y plane:

Equation of movement of the ball in the X axis

X = v₀x*t   Equation  (1)

Equation of movement of the ball in the Y axis

Y = y₀+ v₀y*t -½ g*t² Equation  (2)

Where

X : horizontal position in meters (m)  

Y : vertical  position in meters (m)  

y₀ : initial vertical  position in meters (m)

v₀x :  X-initial speed in m/s  

v₀y :  Y-initial speed in m/s  

g: acceleration due to gravity in m/s²

t : time to position (X,Y)

Data

y₀ = 37.5 m

v₀y = 0

g = 9.8 m/s²

Problem development

The time the ball remains in the air is the same as the ball takes to touch the floor, that is, Y = 0

We apply the Equation (2):

Y = y₀+ (v₀y)*t - (½) g*t²

0 =  37.5 +(0)*t- (1/2)*(g)*t²

0 =  37.5 - (1/2)*(9.8)*t²

(1/2)*(9.8)*t²  = 37.5

t² = (2)(37.5)/(9.8)

t= \sqrt{\frac{2*37.5}{9.8} }

t = 2.77 s

5 0
3 years ago
Who is the father of nuclear physics?​
bija089 [108]

Answer: the father of the nuclear physics is Ernest Rutherford

Explanation:

5 0
3 years ago
The Enterprise goes into orbit around a mysterious planet. The ship moves at 4200 m/s in a circle of radius 4.91 x 10^7 m. What
NeX [460]

Answer:

M = 1.3*10^25 Kg

Explanation:

3 0
3 years ago
A runner starts from rest and attains a speed of 8.00ft/s after 2.00s. What's the runner's acceleration? (keep the answer in ft/
arlik [135]

Answer:

4 ft/s^2

Explanation:

If the velocity is 8ft/s after 2s then to find the acceleration you would use the formula:

\frac{v_f - v_{i} {}}{t} =a

sooooooooo

\frac{8 ft/s - 0 ft/s }{2 s} = \frac{8 ft/s }{2 s} = 4 ft/s^{2}

3 0
2 years ago
Read 2 more answers
If a taxi cab travels 45.8 m/s for 146 s, how far did it travel?<br> Your Answer:
Crazy boy [7]

Answer:

6.68 km

Explanation:

distance = speedxtime

45.8 x 146

6686.6 m

8 0
3 years ago
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