Answer:
Velocity of plane = 30.93 m/s
Explanation:
Considering vertical motion of ball
Initial velocity, u = 0 m/s
Acceleration , a = 9.81 m/s²
Displacement, s = 195 m
We have equation of motion s= ut + 0.5 at²
Substituting
s= ut + 0.5 at²
195 = 0 x t + 0.5 x 9.81 x t²
t = 6.31 seconds
Now considering horizontal motion of ball
Acceleration , a = 0 m/s²
Displacement, s = 195 m
Time, t = 6.31 s
We have equation of motion s= ut + 0.5 at²
Substituting
s= ut + 0.5 at²
195 = u x 6.31 + 0.5 x 0 x 6.31²
u = 30.93 m/s
Velocity of plane is horizontal initial speed of ball = 30.93 m/s
Velocity of plane = 30.93 m/s
Which of the following could negatively affect the reliability of an experiment? A.testing only one variable at a time
B.having variables that are difficult or even impossible to control
C. keeping the control monitored to make sure it remains unchanged
B) Having variables that are difficult or even impossible to control.
ana exerts a force of 20 n on a volleyball that has a mass of 0.15 kg what is the force that the volleyball exerts on ana
Answer:
the answer is -20 N i am doing the review right now and i got it right hope this helps man
Explanation:
A sample of an unknown liquid has a volume of 24.0 mL and a mass of 6 g. What is its density? Show your work or explain how you determined this value.
Answer: 0.25 grams per milliliter
Explanation:
The formula to calculate the density is given by :-
[tex]\text{Density}=\dfrac{\text{Mass}}{\text{Volume}}[/tex]
We are given that the volume of liquid is 24.0 mL.
Mass = 6g
Now, the density of liquid is given by :-
[tex]\text{Density}=\dfrac{6}{24}\\\\\Rightarrow\ \text{Density}=0.25\ g/ml[/tex]
Hence, its density = 0.25 grams per milliliter.
Pls help with this question
Which device requires an electric power supply?
assuming this question:
Which device requires an electric power supply?
A. A turbine
B. A generator
C. A permanent magnet
D. A motor
The answer would be D. a motor
Explanation: a motor turns electrical energy into mechanical energy so it needs an electric power supply
Which of the following describes the difference between the classes of levers? 1 the difference in effort force 2 the difference in resistance force 3the placement of the fulcrum 4 the placement of effort force, resistance force, and fulcrum
Answer:
The placement of effort force, resistance force, and fulcrum.
Explanation:
The placement of effort force, resistance force(which is the load to be moved), and fulcrum differentiates between the classes of levers.
Levers are divided into three classes and they are the first class, second class and third class lever. This machines are differentiated from one another depending on the position of their effort(E), Load applied(L) and the fulcrum (L).
For first class lever, the fulcrum is in between the load and the effort e.g a see-saw, scissors etc
For second class lever, the load is in between the fulcrum and the effort e.g a wheel barrow
For third class lever, the effort is in between the fulcrum and the load e.g a stapler
anonymous 4 years ago The turbidity levels of water in four locations are shown in the table below. Which of these conclusions is most likely correct about the people in the four locations? a. People in Location A would reduce their water consumption. b. People in location B would use only bottled water for drinking purposes. c. People in Location C would complain about foul odor and taste in water. d. People in Location D would observe the least amount of contaminants in water
People in the four locations would complain about the taste and odor of the water due to the turbidity levels of the water.
What connection exists between water quality and T-turbidity?Particulate matter levels beyond a certain threshold have an impact on light transmission, ecological productivity, recreational appeal, habitat quality, and lake filling rates. Increased sedimentation and siltation in streams have the potential to affect fish and other aquatic life habitats. Additional contaminants, including as metals and microorganisms, can cling to particles. As a result, turbidity readings can be used as a sign of possible pollution in a body of water.
What is turbidity?Turbidity is a metric for a liquid's relative clarity. It is a measurement of the amount of light scattered by the components of water when light is shone through a water sample. It is an optical property of water.
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Which of the following statements is true? After one half-life, 75% of the original radionuclide will remain. After two half-lives, 50% of the original radionuclide will remain. After four half-lives, 12.5% of the original material will remain. After three half-lives, 25% of the original material will remain.
Which of the following is a lower body stretch , biceps curl,
Arm circle,
Quadriceps stretch,
Trunk twist
explain how the metric system is based on a system of tens
Final answer:
The metric system is based on a decimal system with fundamental units meter, kilogram, and second, allowing for easy conversions using powers of ten and consistent measurements for objects of all sizes.
Explanation:
The metric system is structured on a base-10 or decimal system, where each unit is a power of ten of the fundamental units for length, mass, and time, which are meter (m), kilogram (kg), and second (s), respectively. In this system, converting between units is as simple as moving the decimal point to the right or left. For example, 1 meter equals 100 centimeters and 1 kilogram equals 1000 grams, illustrating the system's reliance on multiples of ten.
Moreover, the metric system incorporates a set of prefixes to indicate multiples and submultiples based on factors of 10, such as kilo- (1000), centi- (1/100), and milli- (1/1000). This versatility allows easy conversions and ensures consistent measurements for objects of varying sizes, from very small (like a cell) to very large (like a planet).
The bending of light as it passes from one medium to the next is
For adults, the RDA of the amino acid lysine is 12 mg per kg of body weight. How many grams per day should a 78kg adult receive?
An arrow is shot from a bow at 20.0 m/s at an angle of 65º above the horizontal. The arrow leaves the bow at a height of 1.80 m. At what height will it strike a wall that is 10.0 m away? (Remember to connect the two motions of the arrow using time.)
The height it will strike a wall that is 10.0 m away will be 16.38 meters.
How to find the heigth of the wall?In vertical motion the arrow will be accelerating so, we can use equation of motion, but first we need to find initial vertical and horizontal velocity
Horizontal velocity
cos65 = x( horizontal)/20
x = 8.45m/s
Now we can calculate time after which it strike the wall
8.45=10/t
t = 1.18 s this speed in horizontal will remain constant
The vertical intial velocity
sin65 = y(vertical)/20
y=18.13 m/s
Then use the equation of motion to calculate height
s=ut+1/2 at^2
s=(18.13)(1.18)+ 1/2 (-9.8)(1.18^2)
s=21.40-6.822
s=14.58 m
Since it is already 1.80 above ground
The height of wall be =14.58+1.80=16.38
Therefore, the height it will strike a wall that is 10.0 m away will be 16.38 meters.
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A –4.0-µC charge is located 0.45 m to the left of a +6.0-µC charge. What is the magnitude and direction (to the right or to the left) of the electrostatic force on the positive charge?
Because of negative side the direction of Electrostatic force will be right to left that means to the left
Magnitude of Electrostatic force will be = 1.0667 N
What is electrostatic force ?The electrostatic force is an attractive and repulsive force between charged particles . The electric force between stationary charged bodies conventionally known as electrostatic force .
q1 = –4.0 µC
q2 = +6.0 µC
r = 0.45 m
k= 9 * 10 ^ 9
(E) Electrostatic force = k *q1* q2 / r^2
E = (9 * 10 ^ 9) *( –4.0) * ( +6.0) / (0.45)^2
E = - 1066.67 * 10 ^ (-3)
Electrostatic force = - 1.0667 N
Because of negative side the direction of Electrostatic force will be right to left that means to the left
magnitude of Electrostatic force will be = 1.0667 N
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in a star's cycle, which of the following can be thought of as opposites
Which of the following is a benefit of space exploration?
Space exploration has lowered taxes.
Space exploration has helped Florida’s economy.
Space exploration has made some people famous.
Space exploration makes people want to go to outer space.
Space exploration has helped Florida's economy and inspires people to want to go to outer space.
Explanation:The benefit of space exploration is that it has helped Florida's economy, made some people famous, and has inspired people to want to go to outer space. For example, the Kennedy Space Center in Florida has attracted tourism and created jobs, boosting the state's economy. Additionally, astronauts like Neil Armstrong and Buzz Aldrin gained fame for being the first humans to walk on the moon, which brought attention and interest to space exploration.
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If 60 lbs of force must be applied to the valve for it to open, how much upward force must push rod X apply for the valve to open?
Answer:
It must push 40 lbs of force to open the valve.
Explanation:
The momentum at one end of the pivot must be equal to the momentum at the other end. Assuming the 60 lbs of force (F1) is applied at 2 inches from the pivot (d1) and the upward force (F2) is applied at 3 inches from the pivot (d2), then:
F1*d1 = F2*d2
Solving for F2 we get:
F2 = F1*d1/d2
F2 = 60*2/3 = 40 lbs of force
A scientist adds heat to each of the following substances. Which will probably absorb the most heat before its temperature changes significantly? 50 g of solid copper 50 g of solid iron 50 g of liquid water 50 g of sand
Question 2(Multiple Choice Worth 2 points) A drop of water placed on a smooth, dry surface will form a dome-shaped droplet instead of flowing outward in different directions. Which of these best explains this observation? The bonds between hydrogen and oxygen atoms are very strong. The electrons in the atoms attract the electrons in the other atoms. Water molecules at the surface experience fewer hydrogen bonds than water molecules within the liquid. Water molecules near the surface produce more buoyant force than water molecules within the liquid.
Question 3(Multiple Choice Worth 2 points) Which of these best explains what happens when the ionic substance calcium chloride (CaCl2) dissolves in water? The oxygen atoms in the water molecules are attracted to the Ca2+ ions. The oxygen atoms in the water molecules are attracted to the Cl− ions. The hydrogen atoms in the water molecules are attracted to the Ca2+ ions. The oxygen atoms in the water molecules are attracted to the H+ ions.
Question 4(Multiple Choice Worth 2 points) Which of these statements about water is true? Its atoms share electrons equally. It can dissolve all known substances. Its molecules are farther apart in the solid state than in the liquid state. It has a lower specific heat than nearly all known metals.
Which of the following is the tendency for a material to oppose the flow of electrons and change electrical energy into thermal energy?
A. resistance
B. volts
C. Ohms
D> electric current
Answer:
The correct answer is option A.
Explanation:
Resistance :It is a measure of the opposition against the flow of electric current in an electric circuit.It is also defined as ratio of voltage applied to the current. It is measured in Ohms.
[tex]Resistance(R)=\frac{Voltage(V)}{Current(I)}[/tex]
Voltage is defined as work done to move an unit charge from one point to another against the electric field.it is measured in Volts.
Current is defined as flow of electrical charges through an electrical circuit.It is measured in ampere.
what was Galileo’s contribution to the study of motion?
Galileo Galilei was the first to systematically study force and motion.
He began doing so by conducting experiments to search for the cause of motion.
- Marlon Nunez
A cheetah runs with a constant speed of 8 m/s. How far has the cheetah gone after 25 seconds?
what are the characteristics and phases of the moon
A boy of weight 500 N has feet with a total area of 200 cm2.
What is the pressure between him and the ground if he stands on both feet?
solution must be with formula.
Final answer:
The pressure between a person and the ground when standing on both feet can be calculated using the formula: Pressure = Force / Area. By substituting the given values into the formula, we can determine the pressure to be 25000 Pa.
Explanation:
The pressure between a person and the ground when standing on both feet can be calculated using the formula:
Pressure = Force / Area
Given that the weight of the boy is 500 N and the total area of his feet is 200 cm², we can substitute these values into the formula:
Pressure = 500 N / 200 cm²
Now, convert the area to square meters to maintain consistent units:
Pressure = 500 N / (200 cm² x (1 m/100 cm) x (1 m/100 cm))
Pressure = 500 N / 0.02 m²
Pressure = 25000 N/m² or 25000 Pa
So, the pressure between the boy and the ground when he stands on both feet is 25000 Pa.
A 2-kg object is moving horizontally with a speed of 4 m/s. How much net force is required to keep the object moving at this speed and in this direction?
To maintain the constant velocity of a 2-kg object moving horizontally at 4 m/s, no net force is required as per Newton's first law of motion.
Explanation:The question asks how much net force is required to keep a 2-kg object moving horizontally at a constant speed of 4 m/s. In physics, especially when discussing Newton's laws of motion, if an object is moving at a constant velocity, the net force acting on it is zero. According to Newton's first law of motion (also known as the law of inertia), an object will continue to move at its current velocity unless acted upon by a net external force. Therefore, if the 2-kg object is moving horizontally at a steady speed and is not accelerating, the net force required to maintain that steady motion is 0 Newtons.
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All of the following examples involve chemical energy except: A.working muscles using food b.burning a candle c.lightng a match .d.coasting downhill on a bike
objects that exhibit projectile motion follow what kind of path
Answer:
Parabolic
Explanation:
The projectile motion is the example of two dimensional motion under the influence of gravity.
The general equation of projectile motion is
y = x tan theta - gx^2/ 2u^2 cos^theta
It is the quadratic equation in x which shows that it is the equation of a parabola.
Compare and contrast the differences in a persons cardiovascular fitness between an exercise program that utalizes the progression principle and one that does not.
Progression is the classic increase in the fitness of the individual which is essential to achieve fitness goal.
Further Explanation:
Respiratory and circulatory system works together as a coupled unit for delivering oxygen and nutrients to the other part of the body and take away carbon dioxide and waste from the body to support homeostasis. The main purpose of the cardiovascular system is to support the adequate blood flow and supply adequate amount of nutrient to all body tissue and cells and also help in regulating the body temperature.
During physical exercise, the oxygen demand of the muscle tissue increase by 15 to 25 time than normal or rest condition because the more energy is required. A hormone also helps in controlling a number of physiological reactions such as energy formation, reproductive processes, tissue growth and degradation of the muscle protein.
Progression is the classic increase in the fitness of the individual which is essential to achieve fitness goal. When an athlete starts its practice by running in the morning he complete the round in few min. but with each day and session he is able to cover more around in shorter time because he starts to overload himself with each session which is necessary to develop physical fitness.
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Answer Details:
Grade: High School
Subjects: Health
Topic: Physical Fitness
Keywords:
Cardiovascular, exercise, respiratory, circulatory, nutrient, homeostasis, physical, hormones, physiological, degradation, anabolic, catabolic, energy.
The Drake equation calculates the number of technically advanced civilizations in the galaxy as a product of seven factors: R* fp ne fl fi fc L. In the sample calculation in the text, these values are taken as 1 × 1 × 0.1 × 1 × 1 × 1 × 100 = 10. If we were to redo the calculation, increasing each increasable factor by a multiple of ten, what would the result be?
A 9 V battery is connected in series to four resistors as follows: R1 = 2 Ω, R2 = 4 Ω, R3 = 4 Ω, and R4 = 8 Ω. What is the total resistance of the circuit?
A. 0.5 Ω
B. 9 V
C. 18 A
D. 18 Ω
Which factors improve soil fertility? Select the three correct answers. A. Humus B. Bedrock C. Horizon D. Nitrogen E. Manure
Correct answer choices are :
A) Humus
E) Manure
D) Nitrogen
Explanation:
Soil fertility leads to the capability of a soil to support agricultural plant growth, i.e. to produce plant environment and occur in continued and steady yields of high quality. A fertile soil will include all the important nutrients for basic plant nourishment, as well as other nutrients required in smaller amounts.