PHYSICS HIGH SCHOOL

islas change in velocity is 30 m/s, and hazel has the same change in velocity. which best describes explains why they would have different accelerations

Answers

Answer 1
Answer:

Explanation:

Acceleration is defined as change in velocity with respect to change in time.

Mathematically,         Acceleration = \frac{\Delta v}{\Delta t}[/tex]

where        \Delta v = change in velocity

                  \Delta t = change in time

When Islas and Hazel both has change in velocity as 30 m/s but still their acceleration is different then it means that change in time for both of them is different.

Thus, they have different acceleration.
Answer 2
Answer:
Acceleration  =  (change in velocity) / (time for the change) .

They may have had the same change in velocity, but if the changes
happened in different lengths of time, then their accelerations were
not the same.

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Similar poles of bar magnets attract each other.
True
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Answers

(False) similar poles repel and opposite poles attract each other.

Does It take 100 HP to lift a 1000 kg weight from ground to the 4th floor. True or False.

Answers

Answer:NOPE you need more

Explanation:

The power required to lift a weight depends on the force needed and the speed at which the weight is lifted. The force required to lift a weight is given by the equation F = m * g, where m is the mass of the object and g is the acceleration due to gravity (approximately 9.81 m/s² on Earth).

For example, if a 1000 kg weight is lifted 10 m in 10 seconds, the work done can be calculated as W = (1000 kg) * (9.81 m/s²) * (10 m) = 98100 J (Joules). The power required is work done per unit time P = (98100 J) / (10 s) = 9810 W (Watts), which is approximately 9.8 kW¹.

In terms of horsepower, since 1 horsepower is approximately equal to 746 Watts¹, the power required would be about 13.15 horsepower. So, it does not require 100 horsepower to lift a 1000 kg weight from the ground under these conditions. However, these calculations assume ideal conditions and do not take into account factors such as air resistance or mechanical inefficiencies. In real-world applications, more power might be needed.

A car is traveling with an initial velocity of 15 m/s when the driver decides to go faster by accelerating at 5 m/s squared for 10 seconds. How far did the car travel during this time?

Answers

Answer:

x = 400 [m]

Explanation:

To solve this problem we must use the following kinematics equations, first, we find the final speed, and then we proceed to find the distance traveled.

v_(f)=v_(i) +(a*t)\n

where:

Vf = final velocity [m/s]

Vi = initial velocity = 15 [m/s]

a = acceleration = 5 [m/s^2]

t = time = 10 [s]

Note: the positive sign in the Equation indicates that the car is accelerating, i.e. its speed is increasing.

Now replacing

Vf = 15 + (5*10)

Vf = 65 [m/s]

Now using the second equation:

v_(f) ^(2)= v_(i) ^(2)+(2*a*x)

where:

x = distance traveled [m]

x = (65^2 - 15^2)/ (2*5)

x = 400 [m]

Tony walks at an average speed of 70 m/min from his home toschool. If the distance between his home and the school is
2100 m, how much time does it take for Tony to walk to
school?
min

Answers

Answer:

The answer is 30 min

Explanation:

t = s/v

v = 70 m/min, s = 2100 m

t = 2100/70 = 30 min.

Hope it helps you! ＼(^ᴥ^)／

Type 2 diabetes accounts for _______ percent of all cases of diabetes

Answers

Type 2 diabetes is a common and illness that is largely preventable. In adults, types about 90 to 95 percent of all diagnosed cases of diabetes; the remainder are adult-onset (or adult-diagnosed) type 1 diabetes, a form of diabetes for which the cause is unknown

90-95 Percent,  (I took the test and got an 100).

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B. The atom has 7 protons and 7 electrons.
C. The atom has 19 electrons and 19 neutrons.
 D. The atom has 15 neutrons and 15 electrons.

Answers

So we want to know when do we have enough information about the atom that we can say that it is electrically neutral. So the information we need to know is the number of protons, whic are positively charged particles and the number of electrons which are negatively charged particles. Number of protons has to be equal to number of electrons for the atom to have neutral charge. Neutrons are electrically neutral so their number doesn't change the charge of the atom. So the correct answer is B.
b. 7 protons and 7 electrons, just took the test
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