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3 years ago

Can someone help me please

Physics

1 answer:

Semenov [28]3 years ago

6 0

Answer:

distance and time

Explanation:

like miles per hour, its the measure of how far something went durind a span of time, hours.

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A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total

Rudik [331]

Answer:

a) 0.41 m/s

b) 0.51 m/s

Explanation:

(a)

M = total mass of wagon, rider and the rock = 93.1 kg

V = initial velocity of wagon = 0.456 m/s

m = mass of the rock = 0.292 kg

v = velocity of rock after throw = 15.4 m/s

V' = velocity of wagon after rock is thrown

Using conservation of momentum

M V = m v + (M - m) V'

(93.1) (0.456) = (0.292) (15.4) + (93.1 - 0.292) V'

V' = 0.41 m/s

M = total mass of wagon, rider and the rock = 93.1 kg

V = initial velocity of wagon = 0.456 m/s

m = mass of the rock = 0.292 kg

v = velocity of rock after throw = - 15.4 m/s

V' = velocity of wagon after rock is thrown

Using conservation of momentum

M V = m v + (M - m) V'

(93.1) (0.456) = (0.292) (- 15.4) + (93.1 - 0.292) V'

V' = 0.51 m/s

6 0

4 years ago

When a mass rests on a surface, the surface "pushes up" on the object with a force that is equal in

Airida [17]

Answer: 294 N

Explanation:

Since the Normal Force $N$ is equal to the weight $W$ of the dog, we have:

$N=W=m.g$

Where:

$m=30 kg$ is the mass of the dog

$g=9.8 m/s^{2}$ is the acceleration due to gravity on the Earth's surface

Solving:

$N=W=(30 kg)(9.8 m/s^{2})$

$N=294 N$

8 0

3 years ago

What is entropy?

AysviL [449]

Answer: Entropy, the measure of a system's thermal energy per unit temperature that is unavailable for doing useful work. Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system.

Explanation:

3 0

3 years ago

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How<br> are<br> earthquakes measured quantitatively

AlexFokin [52]

Answer:Intensity: The severity of earthquake shaking is assessed using a descriptive scale – the Modified Mercalli Intensity Scale. Magnitude: Earthquake size is a quantitative measure of the size of the earthquake at its source. The Richter Magnitude Scale measures the amount of seismic energy released by an earthquake.

Explanation:

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3 years ago

A magnetic field is aligned perpendicular to the plane of a circular loop of wire with radius 5.0 cm and 20 turns. The magnetic

Mariana [72]

Answer:

$V = 0.157(-36 e^{-3t} + 1.5)$