Two+rocket+ships+approach+a+space+station+at+80%+of+the+speed+of+light.+each+pilot+observes+the+other+ship+approaching+at+____+the+speed+of+light.

Answer:

h = 0.047 m

Explanation:

It is given that,

Radius of an air bubble is 0.0003 m

The surface tension of water is \(7\times 10^{-2}\ N/m\)

We need to find the depth at which an air bubble of radius 0.0003 m will  remain in equilibrium in water. Let it is given by h.

Pressure due to surface tension is given by :

\(P=\dfrac{2T}{R}\) .....(1)

T is surface tension

Also, pressure due to a height is given by :

\(P=\rho gh\)

So, equation (1) becomes :

\(\rho g h=\dfrac{2T}{R}\)

So,

\(h=\dfrac{2T}{\rho gR}\)          

\(h=\dfrac{2\times 7\times 10^{-2}}{10^3\times 9.8\times 0.0003}\\\\h=0.047\ m\)

So, the depth is 0.047 m.

Answer:

the molecules form new chemical bonds

Explanation:

The circumstance which will not occur when water undergoes a physical change is that the molecules form new chemical bonds. Thus, the correct option for this question is B.

Physical change may be defined as a type of change within the compound or things that significantly do not change the chemical properties of the matter. It usually involves the process of transition from one state to another.

When water undergoes a physical change means liquid to solid, solid to liquid, or gas, the motion of the molecules, kinetic energy, and density alter with respect to the state of matter. So, all these attributes are classified into the category of physical change.

Therefore, the molecules forming new chemical bonds is the option that will not occur at any point in time when water undergoes a physical change. Thus, the correct option for this question is B.

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Maximum speed of the child as she swings is  2.23 m/s.

T=3.3 s is the oscillation's time period.

The swing's greatest angle is 25° (max).

The swing's bottom will have the following kinetic energy:

k=12mv2...........(1)

The mass in this situation is m, and the speed is v.

The potential energy change is expressed as,

∆U=mgL1-cosθmax...............(2)

Here, L is a string's length and g is the acceleration caused by gravity. L is given as,

L=gT24π2

Combine equation (1) with (2)

12mv2=mgL1-cos, maxv=2g, maxv=gT24, maxv=g2T22, maxv=9.8 m/s

22.33 m/s, 22.31 s22.31 cos25°

Therefore, the child's top speed is 2.23 m/s.

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Answer:

1

Explanation:

How many digits are in front of the decimal in scientific notation?

Answer: 42.41 cm

Explanation:

Answer:

Displacement

Explanation:

Velocity is more like displacement because

Both have an arrow above their signs which indicates they are vectors.

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Force will be 7.8 N in the given statement.

The magnitude of a force is the diploma to which the force will accelerate the frame it is appearing on and it is represented by way of a scalar (a single quantity). The value also can be the notion of the strength of the force.

Calculations:

According to the question ;

Mass of small object = 2M

Mass of large object = 4M

Here, M = 1.0 kg

Force of the small block = 5.2 N

We need to calculate the acceleration of a 4 kg block

Using the formula of force F = ma

a = f/m =5.2 / 4 = 1.3 m/s²

The 2 kg block is also accelerating at 1.3 m/s², making a total of 6 kg.

Using the formula of force F= ma

F = 6 × 1.3 = 7.8 N

Hence, The force is 7.8 N.

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The thermal energy released when the pan is cooling down with a mass of aluminum is 500 grams and the specific heat capacity is 900J/Kg°C is 83.4 kJ.

Thermal energy is the energy generated by the heat. Thermal energy depends on the mass of the substance, specific heat capacity, and temperature change. The unit of thermal energy is the joule(J).

From the given,

mass of the aluminium pan (m) = 500g = 0.5kg

Specific heat capacity (C) = 900J/kg°C

Temperature initial(T₁) = 204°C

Temperature final (T₂) = 21°C

Change in temperature (ΔT) = T₁ - T₂ = 204 - 21 = 183°C

Thermal energy (Q) = m×C×ΔT

                                = 0.5×900×183

                                =82350J

Thus, the thermal energy released when the pan is cooling down is Q=82.4J.

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\(\rm \text{Work} = -1620 \, \text{Joules} \]\)

The negative sign indicates that Sam does negative work, which means he exerts a force in the opposite direction of the displacement, decelerating the boat to a stop.

To calculate the work done by Sam to stop the boat, we need to use the work-energy principle, which states that the work done on an object is equal to the change in its kinetic energy.

Given:

Mass of the boat and its riders \(\rm (\(m\))\) = 1000 kg

Initial velocity of the boat \(\rm (\(v_{\text{initial}}\))\) = 1.8 m/s

Final velocity of the boat \(\rm (\(v_{\text{final}}\))\) = 0 m/s (as it comes to a stop)

The kinetic energy of the boat initially is given by:

\(\rm \[ KE_{\text{initial}} = \frac{1}{2} m v_{\text{initial}}^2 \]\)

The kinetic energy of the boat finally is given by:

\(\rm \[ KE_{\text{final}} = \frac{1}{2} m v_{\text{final}}^2 \]\)

As the boat comes to a stop, the final kinetic energy \(\rm (\(KE_{\text{final}}\))\) is zero. Therefore, the work done by Sam to stop the boat is:

\(\rm \[ \text{Work} = KE_{\text{final}} - KE_{\text{initial}} = 0 - \frac{1}{2} m v_{\text{initial}}^2 \]\)

Substitute the given values:

\(\[ \text{Work} = 0 - \frac{1}{2} \times 1000 \times (1.8)^2 \]\\\\\ \text{Work} = -\frac{1}{2} \times 1000 \times 3.24 \]\\\\\ \text{Work} = -1620 \, \text{Joules} \]\)

The negative sign indicates that Sam does negative work, which means he exerts a force in the opposite direction of the displacement, decelerating the boat to a stop.

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Answer:

passes

Explanation:

Traditionally, eclipses are divided into two major types: solar and lunar. Solar eclipses occur when the Moon passes between Earth and the Sun, leaving a moving region of shadow on Earth's surface. Lunar eclipses occur when Earth passes between the Sun and the Moon, casting a shadow on the Moon.

Answer:

P.E.= 12.348 joules

K.E.=1.26 joules

Explanation:

Answer:

216 J

Explanation:

h = 1.8

a = 9.8

m = 12.2

GPE = HAM = 216

The gravitational potential energy of a suitcase weighing 120 N sits on a counter 1.8 m high in the airport is 216 Joules.

Gravitational potential energy is the energy which is present inside the body of an object which is at rest. This energy is transformed into kinetic energy as soon as the object changes its state of rest to motion.

The gravitational potential energy of an object can be calculated through the formula:

GPE = m × g × h

where, GPE = Gravitational Potential Energy,

m = mass of the object,

h = height covered by the object

w = m × g

where, w = weight of the object

So, the gravitational potential energy of the object is:

GPE = 120 × 1.8

GPE = 216 Joules

Therefore, the gravitational potential energy of the suitcase is 216 Joules.

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Answer:

orce or acceleration b. Ms. Sunderland finally decided to take this seriously and put both hands on the rope and applied a 1000 N force to the left, while Jared and James still struggled with their 300 N force to the right. What is ... 150 more force. 10. During 5th period Dylan resisted the forces applied by her classmates in a ...

Explanation:

Several radio telescopes are combined into an interferometer in order to 2) observe astronomical objects during daylight hours when the sky is otherwise too bright.

Radio astronomers may combine the signals from several antennas and even telescopes using interferometry. They are able to produce images that are more brighter and more precise than what is feasible with only one antenna dish.

To investigate objects in space, astronomers utilize a variety of telescopes sensitive to various regions of the electromagnetic spectrum. Despite the fact that all light is fundamentally the same, astronomers view light differently depending on the part of the spectrum they are interested in.

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Answer:

=720000kgm/s

Explanation:

The impuse is equivalent to the rate of change of momentum which is expressed below as

Impulse= mv2 - mv1

=m(V2 - V1)

V1= initial velocity= 242 m/s

V2=final velocity= 258 m/s?

m= mass of the plane =45,000 kg

Then if we input the values, we have,

= 45000(258-242)

=720000kgm/s

Hence,the impulse on a 45,000 kg airplane is 720000kgm/s

Answer:

Explanation:

pafterx = (M+m)*v  (x-direction)      M = 1540kg, m = 1210kg, v=23.3 m/s

pafterx = 64075 Ns (x-direction)

paftery = (M+m)*v (y-direction)  M = 1540kg, m = 1210kg, v=0

paftery = 0 (y-direction)

pbeforey = M*vy + m*v*sin(45°) (y-direction)  M = 1540kg, m = 1210kg, v=15.2 m/s

pbeforey = paftery

M*vy + m*v*sin(45°) = 0

vy = (1210*15.2*sin(45°))/1540

vy = -8.44 m/s

pbeforex = M*vx + m*v*cos(45°) (x-direction) M = 1540kg, m = 1210kg, v=15.2 m/s

pbeforey = paftery

M*vx + m*v*cos(45°) = 64075

1540vx =64075 - 13005.1

vx = 33.2 m/s

Answer:

axe kick

crescent kick

cut kick

front snap kick

oblique kick reverse crescents kick roundhouse kick

Explanation:

velocity - the speed with a direction. Thus, inertia could be redefined as follows: Inertia: tendency of an object to resist changes in its velocity. ... Such an object will not change its state of motion (i.e., velocity) unless acted upon by an unbalanced force.

When a chunk of cosmic material the size of a golf ball or a baseball hits the Earth's atmosphere it makes a fireball.

Meteor shower is an event that occurs when tiny particles of stones that are of the size of a golf ball or baseball hits the earth's atmosphere.

As the particles enters the earth's atmosphere, they create friction through rubbing against the particles of the air. This eventually causes the particles to heat up leading to the formation of a fireball.

Meteor shower usually occurs between midnight and the very early hours of the morning.

Therefore, when a chunk of cosmic material the size of a golf ball or a baseball hits the Earth's atmosphere it makes a fireball.

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Answer:

A) Spherically symmetric about a point in the constellation Sagittarius and concentrated in that direction

Explanation:

The globular clusters are present mainly in the direction of Sagittarius with the center of the system of globular cluster being measured as a spherical cluster cloud such that the center of the Milky Way can be taken as being in the Sagittarius constellation

Answer:

concepts of inertia and gravity

The weight of the box is 10 Kg. The normal force acts on the box is 83.4 N. Thus, its acceleration is 8.34 m/s² downwards.

Acceleration of a moving object is its rate of change in its velocity. Acceleration is a vector quantity thus, characterised by magnitude and direction.

According to second law of motion, force is the product of mass and acceleration.

Given the force acting on the box that it experience as the weight = 83.4 N

mass of the box = 10 Kg.

thus, acceleration  = f/ m = 83.4 N/10 kg = 8.34 m/s².

When the elevator is moving upward, the acceleration by its weight is acting downward.

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It is false that you should look for the "Stardust" and "Cronut" certifications and performance markings on motor oil packaging while buying it at a store.

The motor scale ranges from 0W, the thinnest type of oil, to a rating of 60, the thickest type of oil. Because this section of the label displays the viscosity level of oil when an engine is cold, the "W" you see on oil labels stands for the word "Winter."

As a result, 15W-40 and 20W-50 oils were created with hotter regions in mind, whereas 0W-20 and 5W-30 oils were created for cooler areas. Your best choice is to rely on the car's oil life monitoring system to alert you when it's time for a replacement in many newer vehicles. The best location to find your maintenance schedule is in your owner's manual.

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Pastoral nomadism is a system in which i. The entire group of men, women, and children moves with the herd to different places throughout the year. iii. Certain people within the society are assigned to live near the herds, typically in tents.

Certain people within the society are assigned to live near the herds, typically in tents.

Pastoral nomadism is a traditional form of subsistence agriculture practiced by nomadic communities. It involves the herding of animals, such as cattle, sheep, or goats, as the primary means of livelihood.

In this system, the entire community, including men, women, and children, moves together with the herd, often in search of fresh grazing lands and water sources. They set up temporary camps and live in tents close to the animals, allowing them to monitor and care for the herds effectively.

This lifestyle requires constant mobility and adaptability to changing environmental conditions. The nomads rely on their animals for food, milk, clothing, and other essential resources, and the well-being of the herd is crucial to their survival.

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The value of a is 5, the value of b is 5/2 if the triangle is a right angle triangle option (B) is correct.

The trigonometric ratio is defined as the ratio of the pair of a right-angled triangle.

From the tan ratios:

\(\rm tan30 = \dfrac{b}{\dfrac{5\sqrt{3}}{2} }\)

\(\rm \dfrac{1}{\sqrt{3} } = \dfrac{b}{\dfrac{5\sqrt{3}}{2} }\)

b = 5/2

From the cos ratio:

\(\rm cos30 = \dfrac {\dfrac{5\sqrt{3}}{2}}{a}\)

\(\rm \dfrac{\sqrt{3}}{2}= \dfrac {\dfrac{5\sqrt{3}}{2}}{a}\)

a = 5

Thus, the value of a is 5, the value of b is 5/2 if the triangle is a right angle triangle option (B) is correct.

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A boat is pulled into a dock by means of a winch 20 feet above the deck of the boat. If the boat is moving toward the dock at 2 feet per second, when there is 25 feet of rope out. The rate at which the winch is pulling in the rope at this instant is 25 feet per second.

The correct answer is option G.

To solve this problem, we can use the concept of related rates. Let's denote the length of the rope as "r" and the distance between the boat and the dock as "d". We are given that the boat is moving towards the dock at a rate of 2 feet per second.

We need to find the rate at which the winch is pulling in the rope, which can be represented by the derivative dr/dt.

Using the Pythagorean theorem, we can relate the variables "r" and "d":

\(d^2 = r^2 + h^2\)

where h is the height of the winch above the deck of the boat. In this case, h is given as 20 feet.

Differentiating both sides of the equation with respect to time t, we get:

2d * dd/dt = 2r * dr/dt

Simplifying the equation, we have:

dd/dt = (r/dr) * (dr/dt)

We are given that when there is 25 feet of rope out (r = 25), the boat is moving towards the dock at a rate of 2 feet per second (dr/dt = -2).

Substituting these values into the equation, we have:

dd/dt = (25/-2) * (-2) = 25 feet per second

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The question probable may be:

A boat is pulled into a dock by means of a winch 20 feet above the deck of the boat. If the boat is moving toward the dock at 2 feet per second, when there is 25 feet of rope out, what is the rate at which the winch is pulling in the rope at this instant?

A) -2.5

B) 1.5

C) -1.8

D) 1.2

E) 3.1

F) 2.4

G) 25

Beyond "c", the speed of the rocket is; (D) increasing for a while and constant thereafter.

The space shuttle must accelerate from zero to 8,000 metres per second (nearly 18,000 miles per hour) in eight and a half minutes to reach the minimum height necessary to circle the Earth.

The orbital velocity is 7.9 kilometres per second, which translates to more than 20 times the speed of sound. A rocket attaining orbital velocity (1st cosmic velocity) will enter orbit around the Earth (C), whereas a faster rocket would follow an elliptical trajectory (D).

On Earth, air tends to prevent exhaust gases from exiting the engine. This lessens the thrust. However, because there is no atmosphere in space, the exhaust gases may depart considerably more easily and quickly.

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Answer:

Impulse-The effect of force acting over time to change the momentum of an object.

momentum-The product of mass of a particle and its velocity.