Answer:
B) 30 mph northwest
Explanation: Vector quantities have both direction and magnitude. In this case the direction is northwest, and magnitude is 30 mph.
The following is a vector quantity, 30 mph northwest. Option B is correct.
What is a vector quantity?A vector quantity is a physical quantity that has both magnitude and direction. Examples of vector quantities include displacement, velocity, acceleration, force, and momentum.
In contrast, a scalar quantity is a physical quantity that has only magnitude and no direction associated with it. Examples of scalar quantities include speed, distance, mass, temperature, and time.
Here,
A vector quantity is a physical quantity that has both magnitude and direction. In this case, the magnitude is 30 mph and the direction is northwest, which makes it a vector quantity.
Option A is a scalar quantity because it only has a magnitude, but no direction associated with it. Option C is also a vector quantity because it has both magnitude and direction, but it is not given a direction in the question. Option D is a scalar quantity because it only has a magnitude.
Thus, the following is a vector quantity, 30 mph northwest. Option B is correct.
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4. Jed drops a 10 kg box off of the Eiffel Tower. After 2.6 seconds, how fast is the box moving? (Neglect air resistance.)
Answer:29.4m/s
Explanation: Vf=Vi +at= 0 initial velocity +(9.8)(3)= 29.4 m/s
A skater increase her velocity from 3 m/sec to 18 m/sec in 6 seconds.what is the skaters acceleration
the free body diagram four objects are shown Which object has a net force of -5 N down?
Answer:
F-5-89
Explanation:
The net force on a golf cart is 390 N north. If the cart has a total mass of 270 kg,
what are the magnitude and direction of the cart’s acceleration?
Answer:
1.4m/s^2 is the acceleration
Explanation:
magnitude and direction were already given . Using F=ma , acceleration is found .
The magnitude and direction of the cart's acceleration are 1.44 m/s² North.
To solve the given problem, we make use of newton's fundamental equation.
⇒ Newton's equation:
F = ma...................... Equation
⇒ Where:
F = Net force on the golf cartm = mass of the carta = acceleration of the cart.⇒ make "a" the subject of the equation
a = F/m............... Equation 2From the question,
⇒ Given:
F = 390 Nm = 270 kg⇒ Substitute these values into equation 2
a = 390/270a = 1.44 m/s² alone the direction of the force (North)Hence, the magnitude and direction of the cart's acceleration are 1.44 m/s² North.
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A cannonball is launched at ground level at an angle of 30° above the horizontal with
an initial velocity of 26 m/s. How far does the cannonball travel horizontally before it
reaches the ground?
Vi =26m/s g = 9.8m/s^2 vf=0
30°
The cannonball travels horizontally before it reaches the ground at an angle of 30° above the horizontal with an initial velocity of 26 m/s is 59.73 meters.
What is velocity?
When anything is moving, its velocity tells us how quickly that something's location is changing from a certain vantage point and as measured by a particular unit of time.
If a point travels a specific distance along its path in a predetermined amount of time, its average speed throughout that time is equal to the traveled distance divided by the travel time. For instance, a train traveling 100 km in two hours is moving at an average speed of 50 km/h.
Given:
The initial velocity of a cannonball, u = 26 m/s,
Calculate the range of the cannonball by following the formula,
R = [tex]u^2[/tex]sin2θ / g
Here R is the range, and θ is the angle of projection.
Substitute the values,
R = [tex]26^2[/tex] sin2*30 / 9.8
R = 59.73 meters
Therefore, the cannonball travels horizontally before it reaches the ground at an angle of 30° above the horizontal with an initial velocity of 26 m/s is 59.73 meters.
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Which best describes friction? A. a downward pull when objects fall through the air B. a constant force that acts on objects that rub together C. a downward pull on objects that roll on bumpy surfaces D. a constant force that pulls two objects toward each other
PLSSS I NEED HELP 20 POINTS!!!
Answer:
i believe its B
Explanation:
im taking physics and thats the only thing that makes sense to me haha
hope this is right and helps <3
Answer:
It's B: a constant force that acts on objects that rub together
Explanation:
7. A mass m1 of 250 g is on a table connected to a massless pulley, as shown. The coefficient of friction between m1 and the table is 0.228. What is the maximum value of m2 before m1 starts sliding across the table?
Answer:
The minimum mass of m2 before m1 starts sliding across the table is 57 grams
Explanation:
The given mass on the table, m1 = 250 g
The coefficient of friction between the table and the mass, m1, μ = 0.228
Therefore, the friction force, F[tex]_F[/tex] between the mass m1 and the table is given as follows;
F[tex]_F[/tex] = W₁ × μ
Where;
W₁ = The weight of m1 = Mass of m1 × Acceleration due to gravity
W₁ = 250 g × 9.81 m/s² = 0.25 kg × 9.81 m/s² = 2.4525 N
W₁ = 2.4525 N
Which gives;
F[tex]_F[/tex] = 2.4525 N × 0.228 = 0.55917 N
F[tex]_F[/tex] = 0.55917 N
By equilibrium of forces, the weight, W₂, of the mass m2 at which the mass m1 starts sliding is equal to the frictional force F[tex]_F[/tex] of m1 or 0.55917 N
Therefore, for slipping to occur, we have;
W₂ = 0.55917 N
However, W₂ = Mass of m2 × Acceleration due to gravity
∴ W₂ = 0.55917 N = m2 × 9.81 m/s²
0.55917 N = m2 × 9.81 m/s²
m2 = 0.55917 N/(9.81 m/s²) = 0.057 kg = 57 grams
The minimum mass of m2 before m1 starts sliding across the table is 57 grams.
- True or false: A 100 kilogram moon rock has more inertia on Earth than it does on the Moon.
True
False
Which option is a force:
A. velocity
B. acceleration
C. mass
D. weight
Answer:
D
Explanation:
Weight and force have same derived units
I wave is a disturbance in matter that transfers energy through the matter.
Answer:
ok is this a question? if so i can edit my answer
Explanation:
1) The time-rate of change of velocity is
A. acceleration B. distance
C. speed
D. velocity
Answer:
A) acceleration because it's definitely change in velocity definition
1. When human bones are brittle due to eating too much dairy food, what is this called?
2. When a person is working out and they get dry mouth, dizziness, and lack of sweat, what is happening to them.
3. when the arteries of the human heart are clogged by years of plaque build up and the heart can not pump blood through the body correctly, what is this called?
4. Exercises like swimming and bike riding can be put in what exercise category?
5. Eating too much processed food can lead to you getting what?
6. Eating too much meet can lead to you getting what?
Answer:
1. Osteoporosis
2. Dehydration
3. Atherosclerosis
4. Aerobic exercise
5. Heart disease, obesity, diabetes and high blood pressure
6. Coronary heart disease, colorectal cancer, diabetes
Explanation:
1. Osteoporosis is the condition of the bones when they become easily fractured and less dense, such that injuries to the bones are likely to cause disability or pain
2. The bod becomes dehydrated in the event that there is insufficient water for proper functioning of the organs due to the loss of more water than the water that is taken in or absorbed.
3. Atherosclerosis is the building of plaque on the inside and outside of the walls of the arteries by cholesterol, fat, and other compounds in the blood often being taken as a problem or undesirable condition of the heart.
4. Processed foods are those that contain chemicals (that give them a good taste) in proportions that can cause illnesses
5. Taking large quantities of (red) meat such as burgers, or barbecued red meat, can lead to type 2 diabetes, cancers and stroke
1. A Mars rover is packed inside an airbag lander that will bounce on the surface of the planet. The rover will bounce many times before coming to a stop. It is projected that on the first bounce, the lander will project upward at 75° above the horizon with a speed of 9.92m/s. A. How much time will elapse between this first bounce and the second bounce
Answer:
The value is [tex]t = 5.15 \ seconds [/tex]
Explanation:
From the question we are told that
The angle is [tex]\theta = 75^o[/tex]
The speed is [tex]v = 9.92 \ m/s[/tex]
The time taken is mathematically represented as
[tex]t = \frac{ 2 * v * sin (\theta )}{ g}[/tex]
=> [tex]t = \frac{ 2 *9.92 * sin (75 )}{ 9.8}[/tex]
=> [tex]t = 5.15 \ seconds [/tex]
Some parts of this window look brighter than others, even though the same amount of sunlight is striking all parts of the window.
This is happening because some of the light striking the window is
OA. being absorbed.
ОВ.
causing the window to break.
OC. being changed into sound.
OD. being changed into electricity.
Answer:
A
Explanation:
so it looks unequell but it is.
PLEASE HELPPP :))
why do ocean ridges rise above the surrounding ocean floor?
Answer:
because of the disturbence beneath the ocean
hope helps u
the Image shows a portion of the periodic table. which two elements have similar characteristics?
a.
neon and fluorine
b.
chlorine and sulfur
c.
fluorine and chlorine
d.
oxygen and chlorine
e.
argon and fluorine
this is science but I for some reason the science wasnt showing
Answer:
Option C) Fluorine and Chlorine.
Explanation:
According to the given options; the two elements that have similar characteristics are Fluorine and Chlorine.
As both the elements belong to the same group in the periodic table which is the halogen group and they have the same valency although their reactivities differ. Fluorine is more reactive than chlorine if compared. They both are placed in the same group which is Group 7 in the modern periodic table. As both the elements have 7 electrons in their outermost shell.
What are 2 examples of convection, 2 examples of conduction and 2 examples of radiation plsss answer
Answer:
this could probably be useful to you
which of newtons laws explains why when you bump into something you fall backwards
Answer:
Newtons third law
Explanation:
every action has an equal but opposite reaction
it exerts the force back on you
could you vote me brainliest plz? thx :)
6. A child tugs on a rope attached to a 0.62-kg toy with a horizontal force
of 16.3 N. A puppy pulls the toy in the opposite direction with a force 15.8
N.What is the acceleration of the toy? (Hint: Remember direction:
towards child or puppy?)
Answer:
Explanation:
Force Mass * acceleration
F = ma
a = F/m
Sum of force = 16.3N - 15.8N = 0.5N
Mass = 0.62kg
Substitute
a = 0.5/ * 0.62
a = 0.81m/s²
The acceleration of the toy is 0.81m/s²
Sarah launches her purse straight up in air with a velocity of 30.2m/s
How high will it go?
Answer: 46.53
Explanation:
derive mean in science
Explanation:
derive its name from a Native American word meaning wild onion
Suppose you were designing an elevator. How could you use the concept of an Atwood machine to minimize the force required to move the elevator up and down? If possible, discuss your answer with your classmates and teacher.
Answer:
an elevator we can use a counterweight that has the same mass as the empty box,
Explanation:
An Atwood machine consists of two masses connected by a rope through a pulley, in this case the acceleration of the system is proportional to the difference in masses, in the case of equal masses the acceleration is zero.
In the design of an elevator we can use a counterweight that has the same mass as the empty box, in that case when there are no people in the elevator, the natural acceleration is zero and there is no need to apply any force and therefore no power is needed. the motor.
When you have people inside, the power of the motor is what you need to lift the people, not the box, this reduces the power needed by the elevator motor by a high factor.
Using Atwood machine concept, we can state that the elevator can use a system of counterweights that balance the weight inside the box and minimize the force required to move the elevator up and down.
We can arrive at this answer because:
An Atwood machine consists of a system of two masses that counterbalance each other.In this system, the acceleration is caused by the difference between these masses, if there are no differences between them, there is no acceleration of the system.In the case of the elevator, a counterweight system would provide a balance when there were people inside the box.This is because the counterweight would have the mass equal to the mass of the empty box and this would make the entire system not have acceleration.However, when people enter the box, there would be a difference in mass and the system would have acceleration, without forcing a greater force to do so, but using engine power.With that, we can say that an elevator can act as an Atwood machine.
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The mass of this astronaut on the moon is 84kg. If the astronaut is on the moon for 3 weeks then returns home, his mass will be (blank) kg ?
Answer:
84kg
Explanation:
If the mass of an astronaut in on the moon is 84kg on the moon. After the 3weeks in returning home, his weight will not change. The mass of the astronaut will remain the same which is 84kg. This is so because the acceleration due to gravity experienced by the body remains the same both in the earth and in moon.
what is the velocity of a plane that traveled 5000 miles north followed by 10000 miles north in 20 miles?
Answer:
potential energy
Explanation:
potential energy
Chemical energy, the energy stored in chemical bonds, is thus considered a form of potential energy. Some everyday examples of potential energy include the energy of water held behind a dam, or of a person about to skydive out of an airplane.
The velocity of a plane that traveled 5000 miles north followed by 10000 miles north in 20 hours would be 750 miles/hour.
What is Velocity?The total displacement covered by any object per unit of time is known as velocity. It depends on the magnitude as well as the direction of the moving object.
The mathematical expression for velocity is given by
velocity= total displacement/Total time
The total displacement of the plane = 5000 miles +10000 miles
=15000 miles
velocity = displacement/Time
velocity =15000/20 hours
=750 miles/hour
Thus, the velocity of the plane would be 750 miles/hour.
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Your question seems incomplete, the complete question is,
what is the velocity of a plane that traveled 5000 miles north followed by 10000 miles north in 20 hours?
(PLEASE ANSWER QUICKLY)
In the absence of friction, if a force acting on a moving object stops acting, the object will:
a. stop moving
b. keep moving at a constant speed
c. speed up
d. move at a slower speed
Noah drops a rock with a density of 1.73 g/cm3 into a pond. Will the rock float or sink?
Explanation:
Substances with their density less than that of water which is 1 g/cm³ will float on it whiles those greater than that of water will sink into the water
From the question the density of the object is greater than that of water so the object will sink into the water
Hope this helps you
Answer:
The rock will sink because it is more dense than water.
Explanation:
A car weighs 2,000 kg. It moves along a road by applying a force on the road with a parallel component of 560 N. There are two passengers in the car, each weighing 55 kg. If the magnitude of the force of friction experienced by the car is 45 N, what is the acceleration of the car?
Answer:
The acceleration of the car is 4.10 m/s².
Explanation:
The acceleration of the car can be found using the following equation:
[tex] F = ma [/tex] (1)
Where:
F is the force
m is the mass
a is the acceleration
The force is:
[tex]F = F_{p} - F_{f}[/tex] (2)
Where:
F(p) is the parallel force = 560 N
F(f) is the force of friction = 45 N
By entering equation (2) into (1) we have:
[tex]F_{p} - F_{f} = (m_{c} + m_{p}*2)a[/tex]
[tex] 560 N - 45 N = (2000 kg + 55*2 kg)a [/tex]
[tex] a = \frac{2000 kg + 55*2 kg}{515 N} = 4.10 m/s^{2} [/tex]
Therefore, the acceleration of the car is 4.10 m/s².
I hope it helps you!
What is avarage speed? (AS)
speed?
Answer:
average speed = total distance/total time
which of these is a logical hypothesis regarding mass and period
Answer:
An increase in the mass on the string will cause an increase in the period.
Explanation:
We'll begin by writing an expression showing the relationship between the period and mass. This is shown below:
T = 2π√(m/K)
Where:
T is the period of oscillation.
m is the mass of the object.
K is the spring constant.
T = 2π√(m/K)
From the above formula:
The period (T) is directly proportional to the square root of mass (m) and inversely proportional to the square root of the spring constant (K). This implies that an increase in the mass of the object on the spring will result in an increase in the period of oscillation and a decrease in the mass of the object will also decrease the period of oscillation.
An arrow leaves a bow at 60 m/s at an angle of 30 degrees to the horizon.
60 m/s
30
Which best gives the total time of flight for the arrow before it returns to its original
height?
P.4C
Answer: 11
Explanation:
