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3 years ago

What happens to momentum during a collision?...i give brainliest

Physics

1 answer:

Vlada [557]3 years ago

7 0

Answer:

Momentum is the product of a moving object's mass and velocity . ... When two objects collide the total momentum before the collision is equal to the total momentum after the collision (in the absence of external forces). This is the law of conservation of momentum. It is true for all collisions.

Explanation:

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The risk of _______ injury increases with the total amount of physical activity. A. cardiovascular B. musculoskeletal C. cogniti

Lilit [14]

The correct answer here is B - the risk of musculoskeletal injury increases with the total amount of physical activity. Whilst the other forms of injury here do all relate to parts of the body involved in physical activity, it is unlikely that these injuries would occur as a direct result of exercise or strenuous physical activities if the individual in quesiton was healthy to begin with.

8 0

4 years ago

Where is the center of gravity if the 9.00 kg mass of the barbell itself is taken into account?

Pavel [41]

The problem is missing some parts but nevertheless here is the answer:

Given:

1.7 m long barbell with 23 kg weight on the left and 34 in the right end.

Solution:

Calculating from the left side:

Center of gravity = ΣM/ΣW = [23*0 + 9*(1.7/2) + 34*1.7]/[23+9+34]

Center of gravity = .992 m from the left end

3 0

3 years ago

A person pushes on a 57-kg refrigerator with a horizontal force of 267 N; the - sign indicates that the force points in the +x d

disa [49]

(a) -267 N

Explanation: if the refrigerator is not moving, it means that the net force acting on it is zero.

We are only interested in the motion along the horizontal direction; there are two forces acting in this direction:

- The pushing force, forward, F=+267 N

- The static frictional force, backward, $F_f$

Since the net force must be zero, we have

$F+F_f =0F_f = -F = -267 N$

(b) 363.1 N

The largest pushing force that can be applied to the refrigeratore before it begins to move is equal to the magnitude of the maximum static frictional force, which is given by:

$F_f = \mu mg$

where

$\mu=0.65$ is the coefficient of static friction

m = 57 kg is the mass of the refrigerator

g = 9.8 m/s^2 is the gravitational acceleration

Substituting,

$F_f = (0.65)(57 kg)(9.8 m/s^2)=363.1 N$

8 0

3 years ago

Suppose you're using an operant conditioning approach to teach someone how to use a bow and arrow. You begin by teaching your st

snow_lady [41]

Answer:

may be the answer is 'B'

8 0

3 years ago

Calculate the total resistance in a parallel circuit made up of resistances of 2Ω, 3Ω, and 4Ω. (Hint: When converting to a decim

natta225 [31]

Answer:

Total resistance = 0.92Ω

Explanation:

For parallel connected resistors we have effective resistance

$\frac{1}{R_{eff}}=\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}+.....$

Here parallel circuit made up of resistances of 2Ω, 3Ω, and 4Ω.

That is

R₁ = 2Ω

R₂ = 3Ω

R₃ = 4Ω

Substituting

$\frac{1}{R_{eff}}=\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}\\\\\frac{1}{R_{eff}}=\frac{1}{2}+\frac{1}{3}+\frac{1}{4}\\\\\frac{1}{R_{eff}}=\frac{6+4+3}{12}\\\\R_{eff}=\frac{12}{13}=0.92ohm$

Total resistance = 0.92Ω

6 0

3 years ago