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3 years ago

Which of the following is a befit participating in team sports?

Physics

1 answer:

PtichkaEL [24]3 years ago

7 0

Answer: i think its a hope it helps

Explanation:

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chanice drives her scooter 7 km north she stops for lunch and then drives 5 km east what distance did she cover. what was her di

liberstina [14]

Use pythagorean's theorem for this, with 7 as a and 5 as b. pythagorean's theorem says that a^2 + b^2 = c^2, so 7^2 * 5^2 = c^2. this gives you 49 + 25 = c^2, so 74 = c^2. c = sqrt 74, which is approximately 8.60 km

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3 years ago

a 5kg block on a rough horizontal surface is attached to a light spring (force constant=1.6kN/m). the block passes through its e

natima [27]

Answer:

2.12 J

Explanation:

Initial kinetic energy = final elastic energy + work by friction

KE = EE + W

KE = ½ kx² + W

5 J = ½ (1600 N/m) (0.06 m)² + W

W = 2.12 J

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3 years ago

Two hockey pucks with mass 0.1 kg slide across the ice and collide. Before the collision, puck 1 is going 13 m/s to the east and

ohaa [14]

Answer:

13 m/s east

Explanation:

We can solve the problem by using the law of conservation of momentum, which states that the total momentum before the collision is equal to the total momentum after the collision:

$p_i = p_f \\m u_1 + m u_2 = m v_1 + m v_2$

where

m = 0.1 kg is the mass of each puck

u1 = +13 m/s is the initial velocity of puck 1

u2 = -18 m/s is the initial velocity of puck 2 (here I assume the west direction to be the negative direction, so I put a negative sign)

v1 = -18 m/s is the final velocity of puck 1

v2 = ? is the final velocity of puck 2

Simplifying m from the formula and substituting the data, we can find the final velocity of puck 2, v2:

$v_2 = u_1 + u_2 - v_1 = +13 m/s + (-18 m/s) - (-18 m/s) = +13 m/s$

And the positive sign means that puck 2 is moving east.

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3 years ago

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Which represents an endothermic reaction? wood burning in a fire splitting a gas molecule changing frost to water vapor TNT expl

Elis [28]

Answer:

splitting a gas molecule

Explanation:

Endothermic reactions can be regarded as chemical reactions whereby there is absorbing of heat energy by the reactant from the surroundings when forming the products. Cooling effect is created because the reaction will lower the surrounding temperature after it must have absorbed heat. In endothermic reaction, the standard enthalpy change ΔH⚬ is positive. For instance when gas molecules is splitter heat energy is absorbed.

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Satellite A revolves around Earth 5 times a day. What is the radius of its orbit, measured from Earth's center? Assume that Eart

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Answer: 1.44. You can set centripetal force equal to gravitational force caused by the earth because the grav. force is what causes the satellite to orbit in a circle

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