Explanation:
Okay soo-
Given-
u = 60 km/hr = 60×1000/3600=50/3 m/s
t = 20 s
s = 250 m
a = ?
v = ?
Solution -
Here, acceleration is uniform.
(a) According to 2nd kinematics equation,
s = ut + ½at^2
250 = 50/3 ×20 + 0.5×a×20×20
250-1000/3=200a
(750-1000)/3=200a
a = -250/(3×200)
a = -5/12
a = 0.4167 m/s^2
The required uniform acceleration of the car is 0.4167 m/s^2.
(b) According to 1st kinematics equation
v = u + at
v = 50/3 + (-5/12)×20
v = 50/3-25/3
v = 25/3
v = 8.33 m/s
The speed of the car as it passes the traffic light is 8.33 m/s.
Good luck!
A 60-Hz 3-phase induction motor is required to drive a load at approximately 850 rpm. How many poles should the motor have
Answer:
8 poles
Explanation:
Given
[tex]Frequency, f = 60Hz[/tex]
[tex]Speed, n_s = 850rpm[/tex]
Required
Calculate the number of poles the motor should have?
To solve this question, we make use of synchronous angular velocity formula
[tex]n_s = \frac{120f}{P}[/tex]
Where
[tex]P = Number\ of\ Poles[/tex]
Substitute values for [tex]n_s[/tex] and f in [tex]n_s = \frac{120f}{P}[/tex]
[tex]850 = \frac{120 * 60}{P}[/tex]
[tex]850 = \frac{7200}{P}[/tex]
Multiply both sides by P
[tex]P * 850 = \frac{7200}{P} * P[/tex]
[tex]P * 850 = 7200[/tex]
Divide both sides by 850
[tex]\frac{P * 850}{850} = \frac{7200}{850}[/tex]
[tex]P = \frac{7200}{850}[/tex]
[tex]P = 8.47058823529[/tex]
However, the number of poles must be an integer.
So:
[tex]P = 8[/tex]
Which of the following is the use and study of liquid fluids and their motions, properties, behaviors, and interactions?
O pneumatics
O hydraulics
O torque
O fluid power
Answer:
hydraulics
Explanation:
Answer:
b
Explanation:
How large a force is required to accelerate a 1300 kg car from rest to a speed of 20 m/s in a distance of 80 m?
F=m*a
F=80*20
F =1600 ans"
Answer: basically we are asked to find it's force and the formula that helps us to find force is Force= Mass× Acceleration
so let's put out the given and what we need to find
GIVEN. Solution
F=m.a
Mass= 1300. F=1300kg×20m/s
speed (Acceleration)=20m/2. F=26000Kg.m/s
Force=? F=26000N
N stands for Newton and the reason that it comes Newton is because it is the SI-unit of Force and the result of kg×m/s.
In a List of Positive Integers, Set MINIMUM to 1. For each number X in the list L, compare it to MINIMUM. If X is smaller, set MINIMUM to X.” Read this STATEMENT very carefully and Answer the below Questions.
A. Will this Algorithm RUN?? Yes or No with a justification
B. Will X Replace Any Value or Not?
Answer:
A. Yes, it will run
B. X will not replace any value
Explanation:
A. Will it run?
First, the algorithm can be interpreted in python as follows:
#Set Minimum to 1
MINIMUM = 1
#For every element X in the list L
for X in L:
#If current element X is less than MINIMUM
if X < MINIMUM:
#Set MINIMUM to X
MINIMUM = X
#Print MINIMUM
print(MINIMUM)
The algorithm will run without error because it follows the right sequence and has no syntax error
B. Will X replace any value?
No, it won't
The smallest positive integer is 1.
So, setting the MINIMUM to 1 means that the value of X in the list will not replace the MINIMUM because the MINIMUM has already been set
A genetically engineered hormone.
increasing muscle mass.
can treat Mary's child for growth hormone deficiencies by stimulating body growth and increasing muscle mass.
Answer:
the answer is scientifically science chemistry biochemistry aerospace engineering plato english history world ap history yes
Explanation:
que
How much heat is lost through a 3’× 5' single-pane window with a storm that is exposed to a 60°F temperature differential?A. 450 Btu/hB. 900 Btu/hC. 1350 Btu/hD. 1800 Btu/h
Answer:
A. 450 btu/h
Explanation:
We solve this problem by using this formula:
Q = U x TD x area
U = U value of used material
TD = Temperature difference = 60°
Q = heat loss
Area = 3x5 = 15
We first find U
R = 1/u
2 = 1/U
U = 1/2 = 0.5
Then when we put these values into the formula above, we would have:
Q = 0.5 x 15 x 60
Q = 450Btu/h
Therefore 450btu/h is the answer
what is 7/8 + 1/2 on a ruler
Answer:
11/8
Explanation:
7/8+4/8=11/8 if you want it on a ruler you need to go online and type fraction to decimal converter and put in 11/8 into a decimal
Which part of Johnson’s speech is MOST effective in persuading the audience to help build the Great Society?
Answer:
the total elimination of poverty and racial injustice.
Solve for R.
What is the current going through the 6 ohms light bulb?
Answer:
9A
Explanation:
Which of the following would be seen as an improvement on the quality of capital or a positive investment? A. Educational test scores are up. B. An assembly line has been closed down. C. Research and development has improved. D. Irrigation systems have been installed.
Answer:
The correct option is;
D. Irrigation systems have been installed
Explanation:
The quality of capital measures the amount of capital available within an economy and the benefit derivable from the capital
Quality of capital is improved by advances in technology which are the outcomes of research and development. With technological advancement, a unit of capital can enable a unit of labor to increase the amount of goods produced
The difference between a farm which uses manual labor to water the plants and a farm which uses an irrigation system is that the farm that uses manual watering techniques has a lower quality of capital per worker than the farm that has an irrigation system, which is a positive investment.
Cast iron has about how much carbon content?
A)Less than 1%
B)2%
C)3%
D)4% or higher
Answer:
c
Explanation:
Suppose the country of Bangladesh wants a low interest loan to invest in the building of infrastructure. Which international organizations would it MOST LIKELY turn to? A. UNDP or UNICEF B. World Bank or UNICEF C. UNDP or World Bank D. UNDP or IMF
Answer:
C. UNDP or World Bank.
Explanation:
Suppose the country of Bangladesh wants a low interest loan to invest in the building of infrastructure. The international organizations which Bangladesh would most likely turn to are UNDP or World Bank.