# Physics Homework Help

### Showing All Questions Answered Popular Recommended Unanswered Editor's Choice in Physics

• Science
From triangle ABC in the attached figure, `tantheta=(BC)/(CA)` `=p_c/p_t=5.6713` Again conservation of momentum during the collision requires that, `p_c^2+p_t^2=(6000*7.00)^2` `rArr...

Asked by alejandrogalarce on via web

• Science
There are two parts in this problem. Before we can measure the centripetal force in the half-pipe, first we need to get the value of the velocity. With the given values, we can first get the...

Asked by mpumpkin on via web

• Science
LED is an acronym for light emitting diode. An LED is made of a semiconductor material like silicon. The semiconductor is divided into two parts, and an impurity in the form of small amounts of...

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• Science
A raft is able to float on water in spite of the fact that the material it may be made of is heavier than water. This is due to a buoyant force acting upwards created by the water that the raft...

Asked by clara1296 on via web

• Science
The distance (s) traveled by an object starting with an initial velocity u in time t is given by the formula s = u*t + (1/2)*a*t^2 where a is the average acceleration of the object. When a stone is...

Asked by martin178 on via web

• Physics
As an airplane flies, the speed of air passing over the top of the wing is higher than the speed at which air flows below the wing. This creates a differential in the pressure above and below the...

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• Science
A stone is thrown with a speed of 30 m/s in a direction making an angle of 32 degrees with the horizontal. The horizontal component of the velocity of the stone is equal to 30*cos 32 and the...

Asked by blackmary on via web

• Science
A box with mass 20 kg rests on a rough surface, the coefficient of friction between the box and the surface it is placed on is 0.8. If the box is moved, there is a resistive force equal to `F =...

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• Science
The gravitational potential energy of an object with mass m on any planet is given by the general formula PE = m*g*h where m is the mass of the object, g is the gravitational acceleration due to...

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• Science
Physics (1 image)
The rotational inertia of a system is a measure of the system's resistance to angular acceleration. It is the sum of mass x distance squared from the axis of rotation over unit areas of the object...

Asked by gulhan34 on via web

• Science
Physics (1 image)
1. If a stationary person, sitting on a platform that is free to rotate flips a spinning bicycle wheel over, angular momentum has to be conserved, so the person will start spinning in the opposite...

Asked by sevket on via web

• Science
1) The rotational first law states that a body in rotation or at rest tends to keep its state of motion as long as there is no external torque applied to it. The mathematical expression refers to...

Asked by huyruney on via web

• Science
If the initial velocity of a car is u and it accelerates at a rate a for time t, the final velocity is v is equal to v = u + a*t. The distance traveled by the car in reaching the speed v is equal...

Asked by user1648 on via web

• Science
Physics (1 image)
The skater attains an angular speed of 15 rad/s with her arms fully extended. She then draws her arms (and a leg) in and speeds up tremendously. This is the result of conservation of angular...

Asked by TYUINEYE on via web

• Science
Physics (1 image)
The angular momentum of a body having mass `m` with respect to an axis is by definition given the the vectorial product between its position vector `r` measured perpendicular from that axis and...

Asked by tyurkune on via web

• Science
Physics (1 image)
1) If `A =3.0*hati +4.0*hatj-2.0*hatk` and `B =4.0*hati -3.0*hatj+5.0*hatk` then `A xx B =|[hati,hatj,hatk],[3,4,2],[4,-3,5]|=5*4*hati +2*4*hatj -3*3*hatk -4*4*hatk+3*2*hati-3*5*hatj =` `=26*hati...

Asked by tyuenye on via web

• Science
Physics (1 image)
The torque of a force about a point is by definition the vectorial product between the position vector of the point of force application and the value of the force itself. Therefore T= rx F where x...

Asked by tyenhube on via web

• Science
Physics (1 image)
1) The figure is below attached. The torque of a force F with respect to a point O is by definition the vectorial product between the vectors representing the position vector of the force and the...

Asked by yukine2 on via web

• Science
1) The vector product of two vectors is determined as the determinant constructed from the vectors' components: `vecA = 3hati + 4hatj-2hatk` `vecB = 4hati-3hatj + 5hatk` The vector product `vecA xx...

Asked by KINUBDUI on via web

• Science
Physics (1 image)
1. Given an object with a fixed speed that is moving in a circular path with a fixed radius, we can define the angular velocity `omega` of the object. This is the rate of change of radian measure...

Asked by yurkiye3 on via web

• Science
Physics Lab (1 image)
I am not going to do your experimental laboratory but I will answer the two following theoretical questions. 2) We know that a full circle has a circumference equal to: `P =2*pi*R =R*theta` where...

Asked by yuneheie on via web

• Science
Physics (1 image)
1) TRUE Mass is an intrinsic property of matter regardless its other physical properties like for example its form. Thus deforming an object does not change its mass. Moment of inertia of an object...

Asked by gyetnuebe on via web

• Physics
The film and the events it depicts are, in many ways, one giant physics problem. Getting to the moon is one thing, but the specific events depicted in Apollo 13 involved that and more. Physics...

Asked by tourlay99 on via web

• Science
Physics (1 image)
You need to remember that the torque is the equivalent of linear force in rotational movement and its formula is the following, such that: `T = F*d` F represents the magnitude of the force d...

Asked by nfeje on via web

• Science
You need to remember the torque equation, such that: `T = F*d` F represents the magnitude of force d represents the perpendicular distance to pivot axis Since the Sam's force needs to stop the rod...

Asked by nurhan on via web

• Science
Physics (1 image)
A quantitative yo-yo is constructed with a disk fixed to an axle and it has string wrapped around it. The radius of the disk is 5 mm. When the disk is dropped it revolves about a perpendicular line...

Asked by hfueriwrfn on via web

• Science
The slope of the steps is 0.47. Each step has a rise of 0.14 m and a run of 0.3 m. The height of the staircase is 4.8 m. A ball is rolled with a horizontal velocity of 1.09 m/s. Let the ball land...

Asked by fouj97 on via web

• Science
A torque of 12 N*m is applied to a solid, uniform disk of radius 0.50 m. As a result of this, the disk accelerates at 5.7 rad/s^2. If a torque T is applied to an object with moment of inertia I,...

Asked by guyunehye on via web

• Science
The cable car at a ski resort carries skiers a distance of 6.8 km. The cable which moves the car is driven by a pulley with diameter 3.0 m. It can be assumed that there is no slippage as the cable...

Asked by pokunerty on via web

• Science
The angular displacement of the wheel at time t = 0 is zero radians. The angular velocity of the wheel at time t = 0 is 28 rad/s. The constant acceleration of the wheel is -0.51 rad/s^2. As the...

Asked by kinehe on via web

• Science
You need to evaluate the average angular velocity, under the given conditions, such that: `alpha = (omega_f - omega_i)/(t - t_0)` `alpha =(Delta omega)/(Delta t)` The problem provides the...

Asked by jdksdfskj on via web

• Science
a) You need to evaluate the angular displacement of the ball, using the following formula, such that: `theta = S/r` The displacement S = 10 m, and the radius r = 9 cm, hence, you need to convert...

Asked by pokinenn on via web

• Science
a) The initial angular speed is simply `omega_0 = 2*pi*F =2*pi*3600 rad/min =2*pi*3600/60 (rad)/(sec)=` ` =120*pi (rad)/(sec) ~~377 (rad)/(sec)` The initial angular speed is `120*pi` rad/sec b) The...

Asked by kjfuefsap on via web

• Science
If the motion is performed in the absence of friction, then the mechanical energy (kinetic and potential energy) remains constant. This means that if you evaluate the sum of the potential and...

Asked by kineuege on via web

• Science
In regards to point e) If KE = 0, then V = 0. I believe the KE is actually at a minimum, rather than 0, at this point. We might say that there is zero kinetic energy with respect to the vertical...

Asked by mundhye on via web

• Science
Three facts about energy will help us solve this problem: Energy is conserved; without any loss to friction, the total energy will remain constant Potential Energy + Kinetic Energy at one point...

Asked by yutkiye3 on via web

• Physics
At the dam, water falls from a height of 150 m on a turbine with an efficiency of 65%. This implies that 65% of the gravitational potential energy stored in the water is converted to electrical...

• Physics
To solve for the linear distance, apply the relationship between radius and linear distance which is: `s = theta r` Since we have to determine the linear distance in one revolution, then...

Asked by lbawa on via web

• Physics
This is differential equation with separated variables. `dy/dx=(y-1)cotx` `dy/(y-1)=cotx dx` Now we integrate whole equation. `int dy/(y-1)=int cotx dx` `ln(y-1)=ln (sin x)+ln C=ln(C sin x)`...

Asked by user7799710 on via web

• Physics
One way to imagine this question is as a quadrilateral. You're given 3 sides and you've been asked to calculate the remaining side.To do this, sum up the 3 sides you know, and what remains will be...

Asked by lizanna on via web

• Science
The act of spinning a small weight attached to a string in a horizontal plane is the study of centripetal motion. The centripetal force is the force that keeps the weight moving in a circular...

Asked by danielb77 on via iOS

• Physics
All cases are in the figure below. Equivalent resistances are Between A) and B) `R_("eq") = R1 "parallel" (R2 "series" R3) = R1 "parallel" (R2+R3) = (R1*(R2+R3))/(R1+R2+R3)` Between A) and C)...

Asked by blasto63 on via web

• Physics
Assume that you are holing the meter stick at one end and the weight is on the other end. The torque, relative to the point where you are holding it, will be `tau=l*mg*sin(theta)` where l is the...

Asked by MaxxVolume on via web

• Physics
We can use equations of motion here. `v^2 = u^2+2aS` The data we have is: `u = 25m/s` `a = -4.9m/s^2` since we have a deceleration `S = 25m` `v^2 = 25^2-2xx4.9xx25` `v = 19.49m/s` So the...

Asked by enotes on via web

• Physics
When the balloon goes upward with a velocity of 8.8m/s all items inside it has the same velocity of 8.8m/s. When the sand bag get loosed it also have that speed at the moment of loose. The balloon...

Asked by enotes on via web

• Physics
Linear momentum conservation Law is required to answer this question. In the absense of external forces, the linear momentum of a system is conserved. Linear momentum of a body with mass m is mV,...

Asked by alejandrogalarce on via web

• Physics
First of all, let me clarify that we expect that the two objects will hit the ground at the same time if we neglect air resistance. This is so because, acceleration, without air resistance, is...

Asked by hood1960 on via web

• Physics
By definition the mechanical work done by a force `F` that moves a mass along a distance `d` is `W =F**d` where`**` is the scalar product of the vectors representing force `F` and distance `d` . `...

Asked by user742134 on via web

• Physics
a) In any closed system, momentum is conserved. The momentum of a body is calculcated by multiplying the mass and velocity of the body together. `P=mv` If you have two bodies colliding (lets call...

Asked by alejandrogalarce on via web