12,762 Answered Questions for the topic physics

Physics

04/27/22

A point charge, q = -0.35 nC, is fixed at the origin. Where must a proton be placed in order for the electric force acting on it to be exactly opposite to its weight? (Let the y axis be vertical.)

I’m confused on how to get this question started. We haven’t done one like it in class. I just need at least a place to start and a bit of an explanation of what to do. If someone could help, that... more
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Physics

04/27/22

Block Held by Spring
The coefficient of static friction can be determined using the following procedure. A block is held against a vertical wall by compressing a spring attached to the block.If the spring has a spring... more
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Physics Science

04/27/22

Find the maximum height h attained
‎A bullet of ma‎ss m= 7.50 [g] is fire‎d horiznt‎ally with a spe‎ed v= 549 [m/s] in‎to a b‎ob of a b‎allistic pend‎ulum of ma‎ss M= 1.20 [kg]. Fin‎d the maxi‎mum h‎eight h attai‎ned by the bo‎b if... more
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Physics Science

04/27/22

Wh‎at are the spe‎eds of the two pu‎cks after the colli‎sion?
A pu‎ck with m‎ass mA= 3.14 [g] mo‎ves east‎ward with spe‎ed vA= 6.25 [m/s]. It c‎ollides with an‎other p‎uck of ma‎ss mB= 2.99 [g] an‎d is m‎oving no‎rthward with spe‎ed vB=3.65 [m/s]. Aft‎er the... more
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Physics Science

04/27/22

Wh‎at is the sp‎eed of the ba‎ll jus‎t be‎fore it re‎aches the gro‎und
Jeric, a profes‎sional roo‎ftop futbo‎l p‎layer, kic‎ked a 0.550 [kg] b‎all of‎f a r‎ooftop th‎at is 90.0 [m] ‎off the gr‎ound, at 20‎.0 [m/s] ori‎ented 30.0º a‎bove his horizo‎n. Hi‎s p‎al,... more
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04/27/22

In the figure R1 = 5.65 Ω, R2 = 17.0 Ω, and the ideal battery has emf ε = 13.5 V. (a) What is the magnitude of current i1? (b) How much energy is dissipated by all four resistors in 2.36 min?
In the figure R1 = 5.65 Ω, R2 = 17.0 Ω, and the ideal battery has emf ε = 13.5 V. (a) What is the magnitude of current i1? (b) How much energy is dissipated by all four resistors in 2.36 min?
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04/27/22

In the figure four particles are fixed along an x axis, separated by distances d = 3.00 cm.
In the figure four particles are fixed along an x axis, separated by distances d = 3.00 cm. The charges are q1 = +3e, q2 = -e, q3 = +e, and q4 = +8e, with e = 1.60 × 10-19 C. What is the value of... more
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Physics

04/27/22

Physics Question
An elevator cab is pulled upward by a cable. The cab and its single occupant have a combined mass of 1450 kg. When that occupant drops a coin, the tension in the cable is 12.0 kN. What is the... more
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04/27/22

You are given a number of 22 Ω resistors, each capable of dissipating only 2.1 W without being destroyed.

You are given a number of 22 Ω resistors, each capable of dissipating only 2.1 W without being destroyed. What is the minimum number of such resistors that you need to combine in series or in... more
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Physics

04/27/22

Physics Problem

I need help. I dont understand this. Can anyone help me on this plz. AS soon as possible. Thank YOU, this would be really appreciated alot for real. bye. ByeA 50 kg roller coaster pauses at the top... more
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Physics

04/26/22

Simple harmonic
A block on a horizontal frictionless surface is attached to an ideal massless spring whose spring constant is 150 N/m. The block is pulled from its equilibrium positin to x= +0.080m and is released... more
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Physics

04/26/22

Relativity......
If you can't determine if an object is in motion due to the theory of relativity, why can't you just measure the mass, if mass increases with speed and tell if it is moving?
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Physics

04/26/22

The weight of a falling object the moment it hits the ground.

How do I measure the weight of a falling object the moment it hits the ground? For example, a 15kg ball is suspended 100 meters in the air and then dropped.
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Physics

04/26/22

Can we change Kinetic energy to electrical energy or any other energy according to our requirement?
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Physics

04/25/22

circular motion
A rotating platform of radius R = 1.5 cm starts from rest and accelerates with uniform angular acceleration α = 22 rad/s2.a) write an expression that gives the centripetal acceleration on the edge... more
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Physics

04/25/22

circular motion
The angular speed of a rotating platform changes from ω0 = 1.4 rad/s to ω = 8.2 rad/s at a constant rate as the platform moves through an angle Δθ = 8.5 radians. The platform has a radius... more
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Physics

04/25/22

circular motion
At its lowest setting a centrifuge rotates with an angular speed of ω1 = 350 rad/s. When it is switched to the next higher setting it takes t = 12.5 s to uniformly accelerate to its final angular... more
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Physics

04/25/22

circular motion
Suppose a piece of dust is stuck to a CD such that it does not slip even when the CD is spinning.a) if the constant spin rate of the CD is 460rpm, then what is the angular distance in radians, is... more
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Physics

04/25/22

circular motion
 A bicycle wheel has a radius r = 0.24 m and rotates at a constant frequency of f = 59 rev/min.a) calculate the period of rotation of the wheel in T secondsb) what is the tangential speed of a... more
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04/25/22

Electrostatistics (Physics)
Two point charges of -2.0 C are fixed at opposite ends of a meter stick. Where on the meter stick (if anywhere) could (a) a free electron and (b) a free proton are placed so that they are in... more
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Physics

04/25/22

Can Kinetic energy move from one place to another, like one part of a string to another?
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04/24/22

Linear velocity problem
The diameter of the back wheel of a tricycle is 1.5 times longer than the front wheel's diameter. When the tricycle is moving, the surface points of the back wheel move with the linear velocity of... more
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04/24/22

Kinematics: compare the velocities
The motion equations of two moving bodies are:x1=1+3tx2=t+2t2Compare the velocities during a) the end of first five seconds; b) the end of last five secondsThe correct answer for a) should be:... more
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04/24/22

The bus is going with an acceleration of 2 m/s^2. What is the time frame during which the velocity of the bus increases by 72 km/h
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Physics Math

04/23/22

(Help) How to solve this question with solution?
Sable, Labelle, and Mabel are sisters working on their tailor shop. The three sisters needed to push one box each with identical mass to prepare for their day of work. Sable finished the task... more
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