When applying a horizontal force of 30N, an object of mass 6 kg accelerates at 4m/s2. The force of friction on the surface must be ___ N
A toy helicopter begins flying across a field with a speed of 3 m/s and an acceleration of 0.8 m/s2. How long does it take the helicopter to reach a speed of 7 m/s?
What is the magnitude of the instantaneous velocity at 4.00 s?
The required magnitude of the instantaneous velocity at t = 4.00 s is 2 m/s.
What is velocity?Velocity is defined as the rate of change in the position of an object with respect to time.
The displacement function of an object s(t) gives the position of the object at time t. To find the instantaneous velocity at a particular time t, we need to find the derivative of the displacement function with respect to time.
In this case, the displacement function is s(t) = 2t + 4. Taking the derivative with respect to time, we get,
v(t) = ds/dt = 2
This means that the instantaneous velocity of the object is constant and equal to 2 m/s at all times. Therefore, the magnitude of the instantaneous velocity at t = 4.00 s is 2 m/s.
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Complete question-
What is the measure of the magnitude of the instantaneous velocity at 4.00 s where displacement is a function of t, s = 2t + 4?
Train car A is at rest when it is hit by train car B. The two cars, which have the same mass, are stuck together and move off after the collision. How does the final velocity of train cars A and B after the collision compare to the initial velocity of train car B before the collision? The final velocity is double train car B’s initial velocity. The final velocity is the same as train car B’s initial velocity. The final velocity is half of train car B’s initial velocity. The final velocity is zero since train car B will stop.
Answer:
C) The final velocity is half of train B's initial velocity.
Explanation:
The law of conservation of momentum states that in an isolated system, the total momentum of the system will remain constant. In this case, the two train cars will be treated as an isolated system.
Momentum is calculated by multiplying mass and velocity. Because the initial and final momentum are equal, we know that
[tex]m_Av_A+m_Bv_B=m_fm_f[/tex]
Since train A and train B have the same mass, mF = 2mB. Also, train A's initial momentum was 0 because it was at rest. So, we have
[tex]m_Bv_B=2m_Bv_f\\v_B=2v_f[/tex]
So, we find that the final velocity is half of train B's initial velocity.
Nanotechnology and microtechnology devices are both very tiny. However, one property of nanotechnology distinguishes it from microtechnology. What is this unique property?
A particle moving with initial velocity of 5m/s is subjected to a uniform acceleration of -2.5 m/s2.find the displacement for next 4 second
At its nucleus, the milky way galaxy is about 100,000 light-years wide and _____.
At it's nucleus,the milky-way galaxy is about 100,000 light-years wide and 10,000 light-years thick
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A plane traveling at a constant speed is able to travel 600 miles in 5 hours. how fast was the plane flying?
A voltage source in a circuit provides electrical _________.
The electrician's main source of information about electrical installation rules and regulations is the
The answer and how to do it
Magnetic fields are produced by: atoms currents voltages charges
Answer:
curtent
Explanation:
Tp-15 water current has the greatest effect on which type of boat?
Answer: Displacement sailboat
Displacement sailboat are stable even in strong water current for it was designed to glide through the water smoothly with a minimum of power for they have smooth lines and curves that gently move water out of its way. In displacement boat, the water moves gradually where less resistance against the boat is created and the boat ride is smooth and safer.
Which one of the following equations encompasses Boyle's Law, Charles's Law, and the relationship between pressure and temperature when the volume is constant?
A. P = F/A
B. P1V1 = P2V2
C. V1/T1 = V2/T2
D. PV = nRT
From an ethical standpoint, which best describes why new biotechnology products should be tested extensively before they are allowed to be used?
(2 points)
There can be unintended consequences to many new biotechnology products.
Many new products end up being more expensive than they appear to be.
Biotechnology products tend to stop working after a few years.
There are usually no benefits to the products of biotechnology.
Its actually A. I did the same question and A was the correct answer.
There can be unintended consequences to many new biotechnology products so they should be tested extensively before allowed to be used. Option A is correct.
Biotechnology:
It is a field of science that use principles of technology and biology to improve the human lives.
For example-
Vaccines are produced by using the principles of biotechnology.Immunotherapy drugs are also produced by the biotech companies.The effect of biotechnology products in a long term manner cannot be predicted.Therefore, there can be unintended consequences to many new biotechnology products so they should be tested extensively before allowed to be used.
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Where must an object be placed to form an image 30.0 cm from a diverging lens with a focal length of 43.0 cm?
The change in electric potential energy per unit charge is
A) amperes
B) current.
C) gravity.
D) voltage.
correct. D) Voltage is the change in electric potential energy per unit charge. It is sometimes called the electric potential difference
Voltage is called as the change in electric potential energy per unit charge which is called as the electric potential difference. So, the correct option is D.
What is Voltage?Voltage is also called electric pressure, electric tension or potential difference which is defined as the difference in electric potential between two points. This corresponds to the work required per unit charge to move a test charge between two points in a static electric field.
Voltage is called as the change in electric potential energy per unit charge which is called as the electric potential difference. The SI unit for voltage is Volt which is represented by the letter v which derived SI unit of the electromotive force or electric potential.
Therefore, the correct option is D.
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Your question is incomplete, most probably the complete question is:
The change in electric potential energy per unit charge is
A) amperes
B) current.
C) gravity.
D) voltage
At an ocean depth of 10.0 m, a diver’s lung capacity is 2.40 l. the air temperature is 32.0°c and the pressure is 101.30 kpa. what is the volume of the diver’s lungs at the same depth, at a temperature of 21.0°c and a pressure of 141.20 kpa?
Answer:
V = 1.66 L
Explanation:
As we know that at the depth of 10 m the volume of the lungs of diver is given as
V = 2.40 L
Temperature = 32 degree C
Pressure = 101.30 kPa
Now we have change the values of pressure and temperature
Pressure = 141.20 kPa
Temperature = 21 degree C
Now we can use idea gas equation to solve this
[tex]PV = nRT[/tex]
[tex]\frac{P_1V_1}{RT_1} = \frac{P_2V_2}{RT_2}[/tex]
so we have
[tex]\frac{101.30 \times 2.40}{R(273 + 32)} = \frac{141.20 \times V}{R(273 + 21)}[/tex]
[tex]V = 1.66 L[/tex]
You throw a water balloon straight up with a velocity of 12 m/s. What is its maximum height?
Michael is playing with two horseshoe magnets. He is trying to get them to touch, but they will not regardless of how hard he tries. Why will the magnets not come in contact?
It's a good idea to create your procedure so that it's written _____. A. on a computer B. after your conclusions C. with step-by-step instructions D. in a way other scientists can't understand
Answer:
C. with step-by-step instructions
Explanation:
In order to create a procedure that is well understood and easily readily one needs to draw step by step action of the event that can lead to the formation of the proper answer to the query, and help in forming a good ides and proper sentence, also one should try to avoid too many words and use a active voice and be proper explanation of the statements should be made.Explain why cooler stars are red and hotter stars are blue
two charges separated a distance of 1.0 meter exert a 1.0-N force on each other If the charges are pushed to a separation of 1/4 meter the force of each charge would be?
Final answer:
The electrostatic force between two charges increases by a factor of 16 when the distance between them is reduced to a quarter of the original distance, resulting in a new force of 16 N.
Explanation:
The question provided deals with the concept of electric force between point charges, which is described by Coulomb's Law. According to this law, the force F between two point charges is directly proportional to the product of the charges q₁ and q₂, and inversely proportional to the square of the distance r between them. Specifically, F = k * (q₁ * q₂) / r², where k is Coulomb's constant.
In the original scenario, two charges exert a 1.0-N force when separated by a distance of 1.0 meters. When the separation is reduced to 1/4 meter (or 0.25 meters), the distance squared term in Coulomb's Law (r²) becomes (0.25)², which is 1/16 of the original distance squared. Since the force is inversely proportional to the square of the distance, decreasing the distance by a factor of 4 (which squares to be a factor of 16) increases the force by that same factor of 16.
Thus, the new force would be 1.0 N multiplied by 16, resulting in a force of 16 N when the charges are 1/4 meter apart.
An object dropped will hit the ground before an object that is thrown horizontally. true or false?
The correct answer is false.
Hope this helps! ;)
Which describes constant acceleration in one direction? a baseball moving in a curved path over a fence a basketball at rest a skydiver in free fall a car increasing its speed while moving around a curve
Final answer:
A skydiver in free fall describes constant acceleration in one direction since gravity provides a constant acceleration downwards near Earth's surface.
Explanation:
The question asks which scenario describes constant acceleration in one direction. The correct answer is a skydiver in free fall. This is because, near the surface of the Earth, an object in free fall experiences a constant acceleration due to gravity, with a magnitude of approximately 9.8 m/s².
The direction of this acceleration is vertically downwards, and it remains constant in both magnitude and direction in the absence of air resistance.
In contrast, a car rounding a bend, a merry-go-round increasing speed, or a pendulum swinging all experience changing directions or types of motion which do not represent constant acceleration in one direction.
The type of mass movement where rock fragments become airborne is:
((Psychology))According to Sternberg, consummate love includes:
A. attraction and low commitment.
B. intimacy, commitment, and passion.
C. passion, romance, and little responsibility.
D. passion and high commitment.
Answer:
The correct answer is B. According to Sternberg, consummate love includes intimacy, commitment, and passion.
Explanation:
The triangular love theory of the American psychologist Robert Sternberg characterizes love in an interpersonal relationship according to three different components, which are intimacy, passion and commitment:
-Intimacy, understood as those feelings within a relationship that promote the approach, the link, the connection and mainly the self-revelation. Or in other words, the affection towards another person that arises from feelings of closeness, affective bond and relationship, implies the desire to give, to receive, to share, and so on.
-Passion, as a state of intense desire for union with the other, as an expression of desires and needs, great sexual or romantic desire accompanied by psychological excitement.
-Commitment, the decision to love another person and the commitment to maintain that love. This component implies maintaining the relationship in good times and bad times
Alpha century is 4 light years from earth how long would it take for light form alpha centauri to reach earth
Given:
Distance of alpha century = 4 light year
Speed of light = 3 × [tex] 10^{8} [/tex] m
To find:
Time taken by light to reach earth = ?
Formula used:
Distance = speed × time
Solution:
Distance = 4 light year
Converting distance from light year into meter
1 light year = 365 × 24 × 60 × 60
4 light year = 4 × 365 × 24 × 60 × 60× 3 ×[tex] 10^{8} [/tex]
As we know,
Distance = speed × time
s = v × t
Where s = distance
v = velocity
t = time
So,t = [tex] \frac{s}{v} [/tex]
t = [tex] \frac{4 × 365 × 24 × 60 × 60× 3 ×[tex] 10^{8} [/tex]}{3 ×[tex] 10^{8}} [/tex]
t = 4 × 365 × 24 × 60 × 60 second
t = 4 year
Thus, Time taken by light to reach earth from alpha century is 4 earth year.
The image shows a pendulum that is released from rest at point A. Which energy transformation is correct? From A to C, kinetic energy is transformed into gravitational potential energy. From C to D, kinetic energy is transformed into gravitational potential energy. From C to E, gravitational potential energy is transformed into kinetic energy. From D to E, gravitational potential energy is transformed into kinetic energy.
Answer:
Partially: From C to D, kinetic energy is transformed into gravitational potential energy and From D to E, gravitational potential energy is transformed into kinetic energy
Explanation:
What happens in this pendulum is that at point A, there's only gravitational potential energy (no velocity=no kinetic energy)
At point C, it has maximum speed since all of the potential energy is transformed into kinetic energy (no potential gravitational energy at this point)
At point E, it is the same as at point A. (no kinetic energy)
At the intermediate points (B and D) there are both kinetic and potential energy. At point B the kinetic energy is increasing and at point D it is decreasing.
Now let's see each case:
- From A to C, kinetic energy is transformed into gravitational potential energy: It is actually the opposite, so no.
- From C to D, kinetic energy is transformed into gravitational potential energy: Yes, but not all of it is transformed since it still has kinetic energy that allows it to get til point E.
- From C to E, gravitational potential energy is transformed into kinetic energy: No, it is the opposite.
- From D to E, gravitational potential energy is transformed into kinetic energy: Yes, but not all of it, since at point D it also has kinetic energy.
The kinetic energy is transformed into gravitational potential energy from point C to B. But complete transformation is not happening. Thus, the statement is somehow correct.
The analysis of pendulum is given as follows:
At point A, there's only gravitational potential energy and no kinetic energy, because the pendulum is at rest at A. At point C, it has maximum speed since all of the potential energy is transformed into kinetic energy. Therefore, at this point there is only kinetic energy and no potential energy. At point E, it is the same as at point A, but in opposite side. So, at this point there is no kinetic energy. At points B and D there are both kinetic and potential energy. At point B the kinetic energy is increasing and at point D it is decreasing.
Now as per the given statements:
From A to C, kinetic energy is transformed into gravitational potential energy. It is actually the opposite. Thus, the statement is incorrect. From C to D, kinetic energy is transformed into gravitational potential energy. At this interval, the kinetic energy is converting into potential energy but the conversion is not complete. Thus, the statement is somehow correct. From C to E, gravitational potential energy is transformed into kinetic energy. At this point, the kinetic energy is converting into the potential energy. Thus, the statement is incorrect. From D to E, gravitational potential energy is transformed into kinetic energy. This statement incorrect because there is conversion of kinetic energy into potential energy.Thus, we can conclude that from C to D, the kinetic energy is transformed into gravitational potential energy, but the transformation is not complete. Hence, statement (B) is correct.
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-Select ALL that apply-
Absolute zero is ___.
A. 0K
B. –40oC
C. –273oF
D. –273oC
E. the temperature at which water freezes
F. the temperature at which motion is at a minimum