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Cerrena [4.2K]
3 years ago
8

A constant force is applied to an object, causing the object to accelerate at 10 m/s^2. What will the acceleration be if the for

ce is halved and the object's mass is doubled?
Physics
1 answer:
Alika [10]3 years ago
7 0
<span>This can be obtained by following the Newton's Second Law of motion. It states that the acceleration of an object which is produced by a net force is directly related to the net force and inversely related to the mass of the object. We use the equation:

a = F/m
10 = F/2 / 2m
10 = F/4m
40 = F/m

So, the acceleration of the system is 4 times the original conditions.</span>
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Which cars have the same magnitude of momentum? Check all that apply. car 1 car 2 car 3 car 4 car 5
wariber [46]

Answer:

Car 1 and Car 2 have the same momentum!

Explanation:

Using the formula of momentum (P=m*v), we get for each car:

Car 1: 5kg*2.2m/s = 11kg*m/s

Car 2: 5.5kg*2m/s = 11kg*m/s

Car 3: 6kg*1.35m/s = 8.1kg*m/s

Car 4: 6.5kg*1.9m/s = 12.35kg*m/s

Car 5: 7kg*1.25m/s = 8.75kg*m/s

7 0
3 years ago
slab of ice floats on water with a large portion submerged beneath the water surface. The slab is in the shape of a rectangular
n200080 [17]

Answer:

a) \%V = 87.36\,\%, b) x = 1.248\,m, c) F_{B} = 176488.341\,N, d) Six polar bears.

Explanation:

a) The slab of ice is modelled by the Archimedes' Principles and the Newton's Laws, whose equation of equilibrium is:

\Sigma F =\rho_{w}\cdot g \cdot A \cdot x-\rho_{i}\cdot g\cdot V = 0

The height of the ice submerged is:

\rho_{w}\cdot A \cdot x = \rho_{i}\cdot V

x = \frac{\rho_{i}\cdot V}{\rho_{w}\cdot A}

x = \frac{\left(900\,\frac{kg}{m^{3}}\right)\cdot (20\,m^{3})}{\left(1030\,\frac{kg}{m^{3}} \right)\cdot (14\,m^{2})}

x = 1.248\,m

The percentage of the volume of the ice that is submerged is:

\%V = \frac{(1.248\,m)\cdot (14\,m^{2})}{20\,m^{3}} \times 100\,\%

\%V = 87.36\,\%

b) The height of the portion of the ice that is submerged is:

x = 1.248\,m

c) The buoyant force acting on the ice is:

F_{B} = \left(1030\,\frac{kg}{m^{3}} \right)\cdot (1.248\,m)\cdot (14\,m^{2})\cdot \left(9.807\,\frac{m}{s^{2}} \right)

F_{B} = 176488.341\,N

d) The new system is modelled after the Archimedes' Principle and Newton's Laws:

\Sigma F = -n\cdot m_{bear}\cdot g-\rho_{i}\cdot V \cdot g + \rho_{w}\cdot V\cdot g = 0

The number of polar bear is cleared in the equation:

n\cdot m_{bear} = (\rho_{w} - \rho_{i})\cdot V

n = \frac{(\rho_{w}-\rho_{i})\cdot V}{m_{bear}}

n = \frac{\left(1030\,\frac{kg}{m^{3}} - 900\,\frac{kg}{m^{3}} \right)\cdot (20\,m^{3})}{400\,kg}

n = 6.5

The maximum number of polar bears that slab could support is 6.

8 0
3 years ago
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Answer:

potential \: energy = mgh \\  = ( \frac{2500}{1000} ) \times 10 \times 5 \\  = 125 \: newtons

if height is 5 m

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BARSIC [14]

Answer:

6.060606...

Explanation:

To figure out velocity, you divide the distance by the time it takes to travel that same distance, then you add your direction to it. So the distance would be 1000m and the time would be 2 minutes and 45 seconds and if you convert the minutes into fractions you would get 165 seconds than you would divide 1000m by 165 seconds and you would get 6.060606... seconds as her average velocity

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