Calculate the average speed of a bicycle that travels 100m in 20 s.

Answers

Answer 1

Answer: 100m/20s= 5m/s I'd assume is the correct answer

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A net force of 40 N south acts as an object with a mass of 20kg. What is the object's acceleration

Answers

Answer:

a = 2 m/s²

Explanation:

Given: 20 g, 40N

To find: Acceleration (a)

Solution: To find the acceleration (A), divide the force by the weight

A = F ÷ m

= 40 ÷ 20

= 2 m/s²

Newtons are derived units, equal to 1 kg-m/s². In other words, a single Newton is equal to the force needed to accelerate one kilogram one meter per second squared.

The cloud of interstellar dust and gas that forms a star is known as aA. white dwarf.
B. protostar.
C. red giant.
D. nebula.

Answers

D. nebula

Nebula is the cloud of interstellar dust and gas that forms a star. It is collborately shaped during colliding and collapsing of the interstellar mediums this is influenced by the gravitational attraction of the atoms and particles in the entites. Hence, there are three types of nebular namely, are classical nebula, diffuse nebula, planetary nebular and supernova remnants.

A 5.0 g lead bullet is fired into a fence post. The initial speed of the bullet is 210 m/s, and when it comes to rest, half its kinetic energy goes into heating the bullet. How much does the bullet's temperature increase?

Answers

Given the data from the question, the bullet's temperature increases by 85.5 °C

How to determine the kinetic energy

Mass (m) = 5 g = 5 / 1000 = 0.005 g
Velocity (v) = 210 m/s

Kinetic energy (KE) =?

KE = ½mv²

KE = ½ × 0.005 × 210²

KE = 110.25 J

How to determine the increase in temperature

Kinetic energy (KE) = 110.25 J
Heat (Q) = ½KE = ½ × 110.25 = 55.125 J
Mass (M) = 5 g
Specific heat capacity of lead (C) = 0.129 J/gºC

Change in temperature (ΔT) =?

Q = MCΔT

Divide both side by MC

ΔT = Q / MC

ΔT = 55.125 / (5 × 0.129)

ΔT = 85.5 °C

Thus, the temperature increase is 85.5 °C

Learn more about heat transfer:

brainly.com/question/6363778

5g = 0.005 kg
So KE=1/2 0.005 kg * 210m/s^2 = 110 J.
Now the specific heat capacity of lead is 126 J/kgK, so the temperature change= 55 J / 0.005 * 126 J/kgK=87.3015873 K. Which, if normal thermal conditions, the bullet would have a temperature of around 360,451587 Kelvin or, simplified, 107.3 degrees celsius.

When the resultant force acting on a system is zero, the total momentum of the system...

Answers

When the resultant force acting on a system is zero, the total momentum of the system remains constant. This is known as the principle of conservation of momentum. In other words, if the net external force acting on a closed system is zero, the total momentum of that system will not change over time. This principle is commonly applied in physics, particularly in scenarios involving collisions and interactions between objects.

Who was the first person to discover wormholes?

Answers

The first who discovered The Einstein Roses bridge it was discovered by Ludwig flamm in 1916 a few months after Schwarzschild published his solution and was rediscovered by Albert Einstein and his colleague Nathan Rosen which was published then in 1935

as stated in the other ans, wormhole or its scientific name, Einstein–Rosen bridge, was discovered by Ludwig Flamm in 1916. But note that Flamm's discovery was through a general relativity solution on black hole dimension by Schwarzschild. Both Schwarzschild's solution and Flamm's discovery are purely mathematical - no wormhole in reality has been found so far.

An object has a density of 20 g/cm 3 . When placed in a cylinder, it displaces 5 mL of water. What is the mass of the object?

Answers

Note 1mL = 1cm³

5mL = 5cm³.

If it displaces 5mL of water which is equivalent to 5cm³, then its volume is also 5cm³

Density = Mass / Volume

20 g/cm³ = Mass / 5 cm³

Mass = 20 g/cm³ * 5 cm³

Mass = 100 g.

Answer:

100grams

Explanation:

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