Please help me, I'm not good in physics.
You press your physics textbook flat against a vertical wall with your hand. What is the direction of the friction force exerted by the wall on the book? (a) downward (b) upward (c) out from the wall (d) into the wall. (Serway and Jewett, 2009) What type of friction is present?
Answer:
Upward direction.
The friction is kinetic friction
A student places his hand in front of a plane mirror as shown in the diagram. Which terms correctly describe the image that the mirror forms?
13. A glass of water left in the sun becomes warm. Estella adds ice to the water to make
it cool. What energy change occurs when ice is added to the warm drink?
Answer:
second
Explanation:
second
Which vector is the sum of the vectors shown below?
What is the net force on a 100kg object accelerating at 3 m/s
Answer:hence, the force needed to accelerate the 1000kg car by 3m/s2 is 3000N
Explanation:
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How does an air mattress protect a stunt person landing on the ground after a stunt?
Answer:
a) It reduces the kinetic energy loss of the stunt person.
An air mattress acts as a cushion of gas between the stunt person and the ground, absorbing part of the shock if the action person falls.
What is air mattress?An air mattress is an inflated mattress composed of polyvinyl chloride (PVC) and textile-reinforced urethane plastic and rubber. It is also known as an airbed or even a blow-up bed. Deflated mattresses may be compressed and transported and stored in a tiny size.
An air mattress acts as a cushion of gas between the stunt person and the ground, absorbing part of the shock if the action person falls or if it is thrown from a great height. This shields the stunt performer from catastrophic dangers like shattered bones or concussions.
Therefore, an air mattress acts as a cushion of gas between the stunt person and the ground, absorbing part of the shock if the action person falls.
To learn more about air mattress, here:
https://brainly.com/question/11558756
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when you come out of a river you feel cold. why?
Answer:
the wind
Explanation:
32) In an electrical circuit the current is measured in
A) amps using an ammeter.
B) amps using a voltmeter.
C) volts using an ammeter.
D) volts using a voltmeter.
Answer:
A) amps using an ammeter.....
Explain the difference between mass and weight. Also, what happens to your mass and your weight if you were to travel to the moon? Why?
PLEASE HURRY!!
What causes moons to orbit planets and  planets to orbit stars
Answer:Orbits are the result of a perfect balance between the forward motion of a body in space, such as a planet or moon, and the pull of gravity on it from another body in space, such as a large planet or star. An object with a lot of mass goes forward and wants to keep going forward; however, the gravity of another body in space pulls it in.
Explanation:
Anyone able to help with these questions, will give brainliest to first correct anwser
Answer:
b
Explanation:
I did this question earlier
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A man who has type B blood (genotype: BB) is married to a woman with type O blood. What blood type will their children have? blood typing
Newton’s first law of motion states that an object's motion remains the same unless a force acts upon it. What would be an example of this law in action?
Answer:
A driver breaks suddenly and the passengers are flung forward
Which frequencies can humans can hear but not mice
in the equation for the gravitational force between two objects which quantity must be squared?
Answer:
Distance
Explanation:
trust me
Answer:
The distance "r" must be squared
Explanation:
In the equation F=GMm/r^2, the distance "r" is squared, which represents the distance between masses M and m and G is the gravitational constant.
An electric iron is connected to the mains power supply of 220 V. When the electric iron is
adjusted at 'minimum heating' it consumes a power of 360 W but at 'maximum heating' it takes a
power of 840 W. Calculate the current and resistance in each case.
Answer:
Given: V = 220V, Pmin = 360W, Pmax = 840W
For minimum heating case:
We know that
Pmin = VI
360 = 220 X I
I = 1.63 amp
R = V/I
R = 220/1.63
R = 134.96ohms
For maximum heating case:
We know that
Pmax = VI
840 = 220 X I
I = 3.81 amp
R = V/I
R = 220/3.81
R = 57.74 ohms
A 8-kg load stretches an elastic belt 0.02 m. How much will a 12-kg load stretch the belt?
Answer:
0.06
Explanation:
a 6 load will be 0.03 so double it to get the answer which is 0.06
The heat from the sun travels to Earth___
A. In high-frequency waves
B.In low frequency-waves
C.Through the movement of molecules
D.By conduction and convention
Answer:
a in high frequency waves
Explanation:
because of the thermal radiation from the sun
Answer:
The answer is B, "In low frequency-waves"
Explanation:
I got this right on my lesson! Have a great day! (-;
2.5 x 103 kilogram truck with rubber tires moves through a 120 meter radius turn on a dry asphalt surface.
a. Determine the force of friction acting on the truck's tires during the turn.
b. Calculate the maximum speed with which the truck could have made this turn.
Answer:
a. The friction force acting on the truck's tires during the turn, is approximately 20,875 N
b. The maximum velocity with which the truck could make the bend is approximately 31.654 m/s
Explanation:
The given parameters of the truck are;
The mass of the truck, m = 2.5 × 10³ kg
The tire material = Rubber
The radius of the turn the through which the truck moves = 120 meters
The material and condition of the surface = Dry asphalt
a. The coefficient of friction of rubber tires on dry asphalt, μ ≈ 0.85 (researchgate (internet source))
The weight of the truck, W = m × g
Where;
m = The mass of the truck = 2.5 × 10³ kg
g = The acceleration due to gravity = 9.8 m/s²
∴ W = 2.5 × 10³ kg × 9.8 m/s² = 24,500 N
The force of friction acting on the tires, [tex]F_f[/tex] = W × μ
∴ [tex]F_f[/tex] = 24,500 N × 0.85 ≈ 20,875 N
The friction force acting on the truck's tires during the turn, [tex]F_f[/tex] ≈ 20,875 N
b. The centrifugal force the truck observes while turning through the bend, 'F', is given as follows;
F = m·v²/r
Therefore, the maximum velocity with which the truck could make the bend, 'v', is given when fiction force, '[tex]F_f[/tex]', is equal to the centripetal force, F
When [tex]F_f[/tex] = F, we have;
W × μ = m·v²/r
∴ 20,875 N = 2.5 × 10³ kg × v²/(120 m)
∴ v² = 20,875 N × (120 m)/(2.5 × 10^3 kg) = 1002 m²/s²
v = √(1002 m²/s²) ≈ 31.654 m/s
The maximum velocity with which the truck could make the bend, v ≈ 31.654 m/s
According to this question;
The mass of the truck (m) = 2.5 × 10³ kgThe radius of the turn = 120mThe coefficient of friction of rubber tires on dry asphalt, μ ≈ 0.85QUESTION 1:
Weight of the truck (W) = m × gWhere;
m = mass of the truck = 2.5 × 10³ kgg = acceleration due to gravity = 9.8 m/s²W = 2.5 × 10³ kg × 9.8 m/s² = 24,500 NThe force of friction acting on the tires, = W × μ= 24,500 N × 0.85 ≈ 20,875 NThe force of friction acting on the truck's tires during the turn = 20,875 NQUESTION 2:
Centrifugal force of the truck can be calculated as follows: F = mv²/rHowever, force of friction (Ff) is equal to centripetal force (F). That is;W × μ = m·v²/r20,875N = 2.5 × 10³ kg × v²/(120 m)v² = 20,875 × 120/2.5 × 10³ = 1002 m²/s²v = √1002 = 31.654m/sThe maximum velocity with which the truck could make the turn = 31.654 m/s.Learn more about force of friction at: https://brainly.com/question/4230804?referrer=searchResults
A 75 kg baseball player runs at a velocity of 6 m/s and sliding 2 m what is the force of friction that acts upon him?
Answer:
1350N
Explanation:
Given data
mass= 75kg
velocity= 6m/s
distance= 2m
The expression for the applied force is given as
F= mv^2/d
Substitute
F= 75*(6)^2/ 2
F= 75*36/2
F= 2700/2
F= 1350N
Hence the force is 1350N
please please please hellpppppppp!!!!!!
Answer:
The Answer is A
Explanation:
if a circuit has 3 A of current and a 5 ohm resistor, how many volts are powering the circuit
Answer:
Given =
Current = 3 A
Resistance = 5 ohm
Solution =
By Ohm's Law
R = V/I
V = R x I
V = 5 x 3
V = 15 volts. Answer
A 40.0 kg box is placed on a 2.00 m tall shelf. If the box falls off the shelf, what is its kinetic energy as it strikes the ground?
7. Roughly how much did the cost of PV solar panels decrease between 2008 and 2015?
40%
80%
60%
20%
US 0
if tje object is placed pf the focus of a concave mirror the image is formed....
Answer:
when object is kept at focus then image will form at infinity
Explanation:
virtual erect highly diminished image will be formed and it is used in the lense in galilean telescope
what happens as photons of visible light are absorbed by dye molecules?
What came first, a chicken or an egg
Answer:
a chicken
a chicken came first
Answer:
A Chicken
A chicken came first
An object travels a distance of 56 meters to the right in 7 seconds. What is the object's velocity?
Explanation:
Distance travelled (d) = 56 metres
Time taken (t) = 7 seconds
velocity of the object (V)
= d / t
= 56 / 7
= 8 m/s
The velocity of the object is 8 m/s.
Hope it will help :)
write down the expressions for the heat produced per second in a resistor in terms of potential difference and resistance
Answer:
[tex]H=\frac{V^2}{R}[/tex]
Explanation:
Let H be heat produced per sec
Time, t=1 sec
Resistance of resistor=R ohm
We have to write down the expression for the heat produced per second in a resistor in terms of potential difference and resistance.
We know that
Heat, [tex]H=I^2 Rt=\frac{V^2}{R}t[/tex]
Substitute the value
Then, we get
Heat,[tex]H=\frac{V^2}{R}\times 1[/tex]
[tex]H=\frac{V^2}{R}[/tex]
This is required expression for the heat produced per second in a resistor in terms of potential difference and resistance.