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9966 [12]
3 years ago
11

In the simulation above, as the projectile travels downward, how does the vertical velocity change?

Physics
2 answers:
NARA [144]3 years ago
7 0

B) is the correct answer
e-lub [12.9K]3 years ago
7 0

As the projectile travels downward, the vertical velocity increases.

Answer: Option D

<u>Explanation: </u>

If the object was thrown up, it will tend to reach the ground to the gravitational pull. So, exhibiting a projectile motion with an initial velocity, the object travels some distance in air with constant horizontal velocity and varying vertical velocity.

When the object is moving downward, the gravitational force will be more leading to increase in the acceleration and vertical velocity of the object. Thus, the vertical velocity will increase due to the increase in gravitational force acting on the projectile.

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Four hundred seventy joules of heat are removed from a heat reservoir at a temperature of 470 K. What is the entropy change of t
11111nata11111 [884]

Answer:

ΔS= -1 J/K

Explanation:

Given data

Heat Q= -470J

Temperature T=470 K

To find

Entropy change ΔS

Solution

We know that the entropy change of system is ΔS is given by

ΔS=Q/T

We have take heat value Q as negative because the heat is removed from heat reservoir

So

ΔS=(-470J/470K)

ΔS= -1 J/K

8 0
3 years ago
Read 2 more answers
Archimedes supposedly was asked to determine whether a crown made for the king consisted of pure gold (density of gold is 19.3 ×
Vika [28.1K]

Answer:

Explanation:

First, we can find the mass of the object in air

Since W = mg

m = W/g = (8.9)/(9.8) = 0.908 kg

Then, by Archimedes principle, we can find its volume. The volume is found by the weight of the water displaced by the formula

W = Vρg

The Weight is the difference in scale readings. The density of water is 1000 kg/m3

(8.9- 7.8) = V(1000)(9.8)

Thus V = 1 X 10-4 m3

Then, since density is mass / volume

ρ = 0.908/1 X 10-4

ρ = 8254 kg/m3 which is 8 X 103 kg/m3

The density of gold is 19.3 X 103 kg/m3

Since those densities are not the same, the crown is either hollow or not pure gold

8 0
3 years ago
What is the period and frequency of the second hand on a clock?
Allushta [10]

Answer:

Periods are 60 seconds, 60 minutes and 12 hours frequency are their reciprocal.

Explanation:

For second hand, period = 1 min = 3660 s; frequency = 0.0166

For minute hand, period = 1 hr = 3600 s; frequency = 2.77}

For hour hand, period = 12 hrs = 4300 s; frequency = 2.3}

4 0
3 years ago
A yellow train of mass 100 kg is moving at 8 m/s towards an orange train of mass 200 kg traveling on the opposite direction on t
vladimir1956 [14]
Mass of yellow train, my = 100 kg

Initial Velocity of yellow train, = 8 m/s

mass of orange train = 200 kg

Initial Velocity of orange train = -1 m/s (since it moves opposite direction to the yellow train, we will put negative to show the opposite direction)

To calculate the initial momentum of both trains, we will use the principle of conservation of momentum which

The sum of initial momentum = the sum of final momentum


Since the question only wants the sum of initial momentum,

(100)(8) + (200)(-1) = 600 m/s

8 0
2 years ago
Technician A says that the starter motor used to crank diesel engines can draw up to 400 amps of current. Technician B says that
Aleks04 [339]

Answer: Option A : Technician A

Explanation:

The statement/observation, "that the starter motor used to crank diesel engines can draw up to 400 amps of current" made by Technician A is correct.

A diesel engine uses up to 400+ Amperes of electricity to start up a diesel engine in the ignition chamber of motor engine.

8 0
3 years ago
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