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Physics 101 Mechanics Q&A Archive of November 15, 2021

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November 15 of 2021

a) \( 52.5^{\circ} \mathrm{F}, 310 \mathrm{~K}^{-1} \mathrm{H}_{\mathrm{FPOH}} \) 15) A car of mass \( 1600 \mathrm{~kg} \) (including the driver) at rest on a friclionless horizontal icy road. The driver steps on the acceleration pedal and applies a force of \( 800 \mathrm{~N} \). What will…
Can anyone explain the process of solving these
car of mass 1600 kg (including the driver) at rest on a frictioniless horizontal icy road. The driver steps on the acceleration pedal and applies a force of 800 N. What will the acceleration of the car be?
Contirioetal 100 tion An object is moving about a circle with a radius of \( 1.5 \mathrm{~m} \). Calculate the centripetal acceleration if the centripetal velocity is \( 3 \mathrm{~m} / \mathrm{s} \)
A 8800 kg rocket is set for vertical firing from the ground. If the exhaust speed is 810 m/s, how much gas must be ejected each second if the thrust (a) is to equal the magnitude of the gravitational force on the rocket and (b) is to give the rocket an initial upward acceleration of 12…
A vertical truss supports two applied forces F1 and F2. Determine the moment at supports A and B.
A gravity dam weighing 8 K is subjected to water pressure on both sides. Determine the resultant moment about the toe of the dam at B.
\[ \begin{array}{l} -T_{1} \cos (37)+T_{2} \cos (53)=0 \\ T_{1} \sin (37)+T_{2} \sin (53)-T_{3}=0 \\ T_{3}=m g, m=2 k g \\ T_{3}=2 * 9.81=19.6 N \\ \vec{T}_{3}=0 \vec{\imath}-19.6 \vec{\jmath} N \end{array} \] Find \( T_{1} \) and \( T_{2} \)
Ends of three light identical rods each of length l are connected to a light pivot that enables them to rotate in any direction. At the other ends of the rods, three particles A, B and C of masses m, 2m and 3m respectively are affixed. Initially the rods are coplanar, angle between any two is…
A projectile is shot vertically with initial speed v?, neglecting air resistance, and assuming that g is constant, find where the projectile lands when it hits the ground.
(1): A plumb line is carried along in a moving train. If m is the mass of the plumb bob, find the tension in the cord and the deflection from the local vertical if the train is moving with constant acceleration a_o in a given direction (neglect any effects due to the earth’s rotation).
Determine Ix for triangular area 1 of the plane area in Figure 3.
You have been assigned as designer for a 1 mm thin steel plate of density 7850 kg/m3, to be used in a machine element. The technical graphics department provides you with a cross section of the plate shown in Figure 3. You are requested to compute the minimum possible mass moment of inertia…
a 1000 lb. crate is subjected to two applied forces at c. determine the moment about points a and b due to forces f1, f2, and the weight w.
For the hydrogen atom in the ground state, the orbital angular momentum predicted by Bohr's model and its true value are:
What is Newton's first law?
Two projectiles of mass m1 and m2 are ?red at the same speed but in opposite directions from two launch sites separated by a distance D. They both reach the same spot in their highest point and strike there. Their collision is elastic. Find the place they will land.
Block 2 (m2 = 10.0 kg) shown below slides up along a frictionless table as block 1 (m1 = 15.0 kg) slides down. Both blocks are attached by a frictionless pulley. Find the speed of the blocks after they have each moved 2.0 m. Assume that they start at rest and that the pulley has negligible…
61. Consider the 52.0-kg mountain climber shown below. (a) Find the tension in the rope and the force that the mountain climber must exert with her feet on the vertical rock face to remain stationary. Assume that the force is exerted parallel to her legs. Also, assume negligible force exerted…
82 . S h o w n b e l o w i s a b o d y o f m a s s 1.0 k g u n d e r t h e i n f l u e n c e o f t h e f o r c e s F A , F B , a n d m g . I f t h e b o d y i s a t r e s t , w h a t a r e F A a n d F B ?
(b) the displacement of the object when it reaches its maximum speed. 4. In the figure below, a car and a van move toward each other in adjacent lanes and parallel to an \( x \) axis. At time \( t=0 \), the car is at \( x c=0 \) and the van is at \( x v=220 \mathrm{~m} \). If the car has a…
Which one?
See picture.
See picture.
a) \( 52.5^{\circ} \mathrm{F}, 310 \mathrm{~K}^{-1} \mathrm{H}_{\mathrm{FPOH}} \) 15) A car of mass \( 1600 \mathrm{~kg} \) (including the driver) at rest on a friclionless horizontal icy road. The driver steps on the acceleration pedal and applies a force of \( 800 \mathrm{~N} \). What will…
Contirioetal 100 tion An object is moving about a circle with a radius of \( 1.5 \mathrm{~m} \). Calculate the centripetal acceleration if the centripetal velocity is \( 3 \mathrm{~m} / \mathrm{s} \)
A 8800 kg rocket is set for vertical firing from the ground. If the exhaust speed is 810 m/s, how much gas must be ejected each second if the thrust (a) is to equal the magnitude of the gravitational force on the rocket and (b) is to give the rocket an initial upward acceleration of 12…
A vertical truss supports two applied forces F1 and F2. Determine the moment at supports A and B.
\[ \begin{array}{l} -T_{1} \cos (37)+T_{2} \cos (53)=0 \\ T_{1} \sin (37)+T_{2} \sin (53)-T_{3}=0 \\ T_{3}=m g, m=2 k g \\ T_{3}=2 * 9.81=19.6 N \\ \vec{T}_{3}=0 \vec{\imath}-19.6 \vec{\jmath} N \end{array} \] Find \( T_{1} \) and \( T_{2} \)
Ends of three light identical rods each of length l are connected to a light pivot that enables them to rotate in any direction. At the other ends of the rods, three particles A, B and C of masses m, 2m and 3m respectively are affixed. Initially the rods are coplanar, angle between any two is…
A projectile is shot vertically with initial speed v?, neglecting air resistance, and assuming that g is constant, find where the projectile lands when it hits the ground.
(1): A plumb line is carried along in a moving train. If m is the mass of the plumb bob, find the tension in the cord and the deflection from the local vertical if the train is moving with constant acceleration a_o in a given direction (neglect any effects due to the earth’s rotation).
Determine Ix for triangular area 1 of the plane area in Figure 3.
You have been assigned as designer for a 1 mm thin steel plate of density 7850 kg/m3, to be used in a machine element. The technical graphics department provides you with a cross section of the plate shown in Figure 3. You are requested to compute the minimum possible mass moment of inertia…
a 1000 lb. crate is subjected to two applied forces at c. determine the moment about points a and b due to forces f1, f2, and the weight w.
For the hydrogen atom in the ground state, the orbital angular momentum predicted by Bohr's model and its true value are:
What is Newton's first law?
Two projectiles of mass m1 and m2 are ?red at the same speed but in opposite directions from two launch sites separated by a distance D. They both reach the same spot in their highest point and strike there. Their collision is elastic. Find the place they will land.
Block 2 (m2 = 10.0 kg) shown below slides up along a frictionless table as block 1 (m1 = 15.0 kg) slides down. Both blocks are attached by a frictionless pulley. Find the speed of the blocks after they have each moved 2.0 m. Assume that they start at rest and that the pulley has negligible…
61. Consider the 52.0-kg mountain climber shown below. (a) Find the tension in the rope and the force that the mountain climber must exert with her feet on the vertical rock face to remain stationary. Assume that the force is exerted parallel to her legs. Also, assume negligible force exerted…
82 . S h o w n b e l o w i s a b o d y o f m a s s 1.0 k g u n d e r t h e i n f l u e n c e o f t h e f o r c e s F A , F B , a n d m g . I f t h e b o d y i s a t r e s t , w h a t a r e F A a n d F B ?
(b) the displacement of the object when it reaches its maximum speed. 4. In the figure below, a car and a van move toward each other in adjacent lanes and parallel to an \( x \) axis. At time \( t=0 \), the car is at \( x c=0 \) and the van is at \( x v=220 \mathrm{~m} \). If the car has a…
Which one?
See picture.
See picture.