Physics Homework Aid
Physics holds significant importance among the natural sciences, elucidating life's wonders and ranking among the most challenging subjects to master.
QuestionAI is a rich and user-friendly physics problem solver for novice physicists, enabling exploration of atomic properties and interactions, alongside molecular trajectories under various forces. Furthermore, you can delve into the mysteries concealed amidst galaxies with fellow physics enthusiasts. Boldly pose your conjectures and queries to the AI, and authoritative answers will readily emerge.
- 3. A fixed point O lies on a straight line. A particle P moves along this line. At time t=0 , particle P passes through 0 At time t seconds. tgeqslant 0 the velocity, vms^-1 of P is v=6+4t^(3)/(2)-3t^2 (a) Find the acceleration of P at time t seconds. (b) Find the distance of P from 0 at the instant when tgt 0 and the acceleration of P is zero. (2) (6)
- 2. [In this question i and j are horizontal unit vectors.] A particle P of mass 5kg is moving on a smooth horizontal plane. The particle P is moving under the action of two forces (i+2j)N and (-ci-10j)N where c is a positive constant. The magnitude of the acceleration of P is 2ms^-2 Find the value of c
- The diagram illustrates the locations of the Sun.Moon, and Earth. Moon not drawn to scale How does the Moon appear to a person standing at location A on Earth? A. B. C. D.
- Contraction joints are used between big slabs of concrete or asphalt during road construction. These joints prevent roads from cracking dur large changes in temperature. Physical properties of some common materials are given in the table. Material & }(c) Melting Point (( )^circ mathrm(C)) & Thermal Coefficient (10^-6 /( )^circ mathrm(C). at .20^circ mathrm(C)) & Density (mathrm(g) / mathrm(cm)^3) aluminum & 660 & 23 & 2.70 iron & 1538 & 11 & 7.87 rubber & 128 & 77 & 0.92 silicon & 1410 & 3 & 0.97 The thermal coefficient represents the increase in volume of the material when the temperature increases by one degree. Based on the data, which material is most likely to be used as a contraction joint? A. aluminum B. iron C. rubber D. silicon
- Computers record music by changing sound waves into signals that the computers can store. They then decode these signals to reproduce the music that the signal represents. Analog recordings accomplist this with a signal that is continually changing This signal is a re-creation of the sound wave of the musiC. Digital recordings are samples of the music that computers store as a series of numbers. This creates a type of square wave. Later, computers decode these numbers to reproduce the recorded sound. A student claims that digital signals create more reliable recordings of music than analog signals do. Which statement supports this claim? A. Computers encode digital signals, which makes them more secure. B. Digital recordings take more samples every second than analog recordings do. C. Digital recordings are exact replicas of the sound waves that the music generates. D. Digital recordings contain fewer errors because computers store the music as a series of numbers.