Forces that are ____ result in a net force of zero

▪︎balanced

▪︎Unbalanced ​

Explanation:

Given,

mass of block = 30 kg

initial speed = 1.2 m/s

coefficient of friction = 0.20

time for elevator close and opening = 5.0 sec

for t= 0 sec to t= 4.0 sec

acceleration = 0

speed = 1.2 m/s

distance x= vt

at t=4 distance is x=4.8m

for t= 4.0 sec to next 5 second or t= 9.0 sec

the remaining distance for cover is

x= 16-4.8

x=11.2 m

using motion equation

x=vt+1/2at^2

11.2=1.2*5+1/2 0.5aa=0.416 m/s^2

Answer:

5 sec

Explanation:

more than mg

Explanation:

the pressure

Answer:

12 seconds in the air

2.5

very high

132

Explanation:

Answer:

Explanation:

The mass of the person can be found by using the formula

[tex]m = \frac{p}{v} \\ [/tex]

p is the momentum

v is the velocity

From the question we have

[tex]m = \frac{52}{0.8} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

20m/second

Explanation:

The reason the answer is 20m/second is because to find the speed of the ball  in this question you have to divide the distance over the time giving you the result of 20m/second

Answer:

The dilation of time.

The falling of objects.

The changing of paths of light.

Explanation:

I have explained in the image attached below.

From the explanation, the correct ones are;

The dilation of time.

The falling of objects.

The changing of paths of light.

Answer:

lava

Explanation:

Answer:

i would say either more or the same

Explanation:

The answer you are looking for is approximately 9.4 m/s.

Solution/Explanation:

First, writing out the formula for the speed of an object, encompassing distance and time, in meters per second, or m/s,

S=D/T.

"S" stands for "Speed."

"D" stands for "Distance."

"T" stands for "Time."

Speed (S)=????

Distance (D)=100m.

Time (T)=10.6s.

Substituting the given values of the variables,

S=100m/10.6s.

100÷10.6=9.43396226415≈9.4.

So, therefore, the final answer is approximately 9.4 m/s.

I hope that this has helped answer your question. Good day to you.

Answer:

the Noble gases

Explanation:

the Noble gases are atoms that do not easily react with or form bonds with other atoms

Answer:

option A

Explanation:

wave speed= 650×35= 22750 m/s

hope it helps !

Answer:

option is the correct answer mark me as a brain list pls

Answer:10

Explanation:

You have to do speed divided by time so your answers 10

Answer:

a) t = 2.55s

b) [tex]v_{0x} = 9.80 m/s[/tex]

c) yes

Explanation:

In order to solve this problem, we can start by drawing a sketch of the situation so we can better visualize what the problem is about (see attached picture).

a)

For the first question. We are talking about a movement in two dimensions. So on the first question they are asking us for vertical movement. It will be uniformly accelerated, so we can use the following formula:

[tex]y_{f}=y_{0}+V_{0y}t+\frac{1}{2}at^{2}[/tex]

We know the following:

[tex]y_{f}=0[/tex]

[tex]y_{0} = 32m[/tex]

[tex]V_{0y}=0[/tex]

t=?

[tex]a=-9.81 m/s ^{2}[/tex]

With this data, we can simplify our equation, so we end up with:

[tex]y_{0}+\frac{1}{2}at^{2}=0[/tex]

so we can now substitute the data we know and solve for t:

[tex]32m-\frac{1}{2}(9.81 m/s^{2})t^{2}=0[/tex]

[tex](-4.905 m/s^{2})t^{2}=-32m[/tex]

[tex]t^{2} = \frac{-32m}{-4.905 m/s^{2}}[/tex]

[tex]t=\sqrt{6.52s^{2}}[/tex]

t = 2.55 s

b)

For part b, since we are talking about horizontal movement and we are neglecting drag, this means that his horizontal speed will be constant. So we can use the following formula:

[tex]V_{x}=\frac{x}{t}[/tex]

we know he most move a horizontal distance of 25 meters in a time of 2.55s so we get:

[tex]V_{x} = \frac{25m}{2.55s}[/tex]

[tex]V_{x}=9.80 m/s[/tex]

c) for part c, we can do the conversion between miles per hour to meters per second like this:

[tex]\frac{27mi}{1hr}*\frac{1hr}{3600s}*\frac{5280ft}{1mi}*\frac{0.3048m}{1ft}[/tex]

so the given initial speed is equivalent to:

12.07 m/s

this is greater than the minimum 9.80 m/s we need, so the skater will clear the pool at this speed.

(a) The time spent in air by the skateboarder is 2.56 s

(b) The initial speed needed by the skateboarder to clear the pool is 9.77 m/s.

(c)  The skateboarder with given initial speed of 27 mph will clear the pool since it is greater than minimum initial velocity required.

The given parameters;

The time spent in air by the skateboarder is calculated as follows;

[tex]h = v_0t + \frac{1}{2} gt^2\\\\h = 0 + \frac{1}{2} gt^2\\\\gt^2 = 2h\\\\t = \sqrt{\frac{2h}{g} } \\\\t = \sqrt{\frac{2\times 32}{9.8} } \\\\t =2.56 \ s[/tex]

The initial speed needed by the skateboarder to clear the pool is calculated as;

[tex]v = \frac{d}{t} \\\\v = \frac{25}{2.56} \\\\v = 9.77 \ m/s[/tex]

The initial speed of the skateboarder is m/s;

[tex]27 \ \frac{mile}{hour} \times \frac{1609.3 \ m}{1 \ mile} \times \frac{1 \ hr}{3600 \ s} = 12.07 \ m/s[/tex]

Thus, the skateboarder with given initial speed of 27 mph will clear the pool since it is greater than minimum initial velocity required.

Learn more here:https://brainly.com/question/14670531

The work done by the force sill be 600 joules and the increase in kinetic energy will be same as 600 joules.

Work done by a force is defined as the dot product of the force and the displacement caused by it. Mathematically -

W = F . d

W = |F| x |d| x cos Ф

Given is net Force Of 60 N that accelerates a 4 kg Mass Over A Distance of 10 meter.

We can calculate the work done by the formula discussed above. Therefore -

W = F . d

W = |F| x |d| x cos(0)

W = 60 x 10

W = 600 joules

Now, using the work - energy theorem, the change in kinetic energy is equal to work done. Therefore -

ΔE[K] = W = 600 joules

Therefore, the work done by the force sill be 600 joules and the increase in kinetic energy will be same as 600 joules.

To solve more questions on work done, visit the link below-

https://brainly.com/question/13865035

#SPJ2

Answer:

mgi

Explanation:

Answer: x = 7

Explanation: 12 = 14 -2 = 12.

Answer:

Explanation:

Biomechanics- The study of human movement.

SMART Goal- Specific, measurable, attainable, realistic, & timely - pay attention the how the words start this one was an easy giveaway

Muscular Endurance- Physical activity that can be sustained for a long time because the body can supply enough oxygen.

Answer:

147 newton.

Explanation:

Force is the product of mass and acceleration. The formula of force is given below: Force =  mass x acceleration, but due to height we put gravity instead of acceleration. So by putting values of mass i. e. 15 kg and gravity i. e. 9.8 meter/ second in the formula we get the net force of the ball which is 147 newton or 147 kg meter/second square.

Answer:

F' = 9F

Explanation:

The electric force between charges is given by :

[tex]F=\dfrac{kq_1q_2}{r^2}[/tex]

It means,

[tex]F\propto \dfrac{1}{r^2}[/tex]

If distance decreased by a factor of 3, r' = r/3

Net force will become,

[tex]F'=\dfrac{kq_1q_2}{r'^2}\\\\=\dfrac{kq_1q_2}{(\dfrac{r}{3})^2}\\\\=9\dfrac{kq_1q_2}{r^2}\\\\=9\times F[/tex]

It means new force will become 9 times that of the initial force.

Answer:

it is increased by a factor of 9

Explanation:

just took the test

Answer:

135

Explanation:

Answer:

A) 1.2x10^5 J

Explanation:

Answer:

Approximately [tex]2.2\; \rm cm^{3}[/tex] (assuming that this gas is ideal, and that the initial volume of this gas is [tex]4.0\; \rm cm^{3}[/tex].)

Explanation:

In this question, both the pressure on the gas and the temperature of the gas have changed. However, the ideal gas laws (Boyle's Law and Charles' Law) requires that only one of the two quantity change at a time. Therefore, consider this change in two steps:

Boyle's Law states that for a fixed quantity of some ideal gas, if temperature is held constant, the volume of the gas will be inversely proportional to the pressure on the gas.

Let [tex]V_0[/tex] denote the initial volume of this gas. The question states that at [tex]P_0 = 2.0\times 10^{5}\; \rm Pa[/tex] and [tex]T_0 = 288\; \rm K[/tex], the volume of the gas is [tex]V_0 = 4.0\; \rm cm^{3}[/tex].

By Boyle's Law, if temperature is held constant ([tex]T_1 = T_0 = 288\; \rm K[/tex],) then at [tex]P_1 = 1.6 \times 10^{5}\; \rm Pa[/tex]:

[tex]\begin{aligned} V_1 &= V_0 \cdot \frac{P_0}{P_1} \\ &= 4.0\; \rm cm^3 \times \frac{2.0 \times 10^{5}\; \rm Pa}{1.6 \times 10^{5}\; \rm Pa} \approx 5.0\; \rm cm^{3} \end{aligned}[/tex].

On the other hand, Charles' Law suggests that for a fixed quantity of some ideal gas, if the pressure of the gas is held constant, the volume of the gas will be proportional to the temperature (in degree Kelvins) of the gas.

Let [tex]V_1[/tex] denote the volume of this gas before the temperature change. At [tex]P_0 = 2.0\times 10^{5}\; \rm Pa[/tex] and [tex]T_0 = 288\; \rm K[/tex], previous calculations show that [tex]V_0 = 5.0\; \rm cm^{3}[/tex].

By Charles' Law, if the pressure of this gas is held constant ([tex]P_2 = P_1 =1.6 \times 10^{5}\; \rm Pa[/tex],) then at the new temperature [tex]T_2 = 125\; \rm K[/tex]:

[tex]\begin{aligned} V_2 &= V_1 \cdot \frac{T_1}{T_0} \\ &= 5.0\; \rm cm^3 \times \frac{125\; \rm K}{288\; \rm K} \approx 2.2\; \rm cm^{3} \end{aligned}[/tex].

Therefore, at [tex]T_2 = 125\; \rm K[/tex] and [tex]P = 1.6 \times 10^{5}\; \rm Pa[/tex], the volume of this gas would be approximately [tex]2.2\; \rm cm^{3}[/tex].

Explanation:

Variety in to an exercise program allows the body to adapt to many demands, from high intensity exercise to slow, steady state exercise. Variety is important in a fitness program because it allows for your body to be challenged on a consistent basis and to overcome a plateau.

Answer:

stay in doors and away from the windows

Explanation:

Answer:

During a thunderstorm, you should remain indoors and have a weather radio handy. Your family should be prepared for the possibility of high winds and power failures. Have candles, emergency supplies, food, and water accessible. Some thunderstorms have been known to cause power failures for millions of people at a time. During a severe weather event, the National Weather Service will issue watches and warnings associated with the storm system. A watch means that severe weather may be possible in the near future. You should take precautions during a watch. A warning is issued when severe weather is likely to strike at any moment. All watches and warnings for severe weather should be listened to carefully.

Answer:

in case of a car crash they will prevent you from flying out of your seat (not litteraly) and keep you safer than what you would be without them!

Explanation:

to keep you safe (simple answer lol)

Answer: